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 </pre><pre class="rust"><code><span class="doccomment">//! Generic data structure deserialization framework.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The two most important traits in this module are [`Deserialize`] and</span>
 <span class="doccomment">//! [`Deserializer`].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//!  - **A type that implements `Deserialize` is a data structure** that can be</span>
 <span class="doccomment">//!    deserialized from any data format supported by Serde, and conversely</span>
 <span class="doccomment">//!  - **A type that implements `Deserializer` is a data format** that can</span>
 <span class="doccomment">//!    deserialize any data structure supported by Serde.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # The Deserialize trait</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Serde provides [`Deserialize`] implementations for many Rust primitive and</span>
 <span class="doccomment">//! standard library types. The complete list is below. All of these can be</span>
 <span class="doccomment">//! deserialized using Serde out of the box.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Additionally, Serde provides a procedural macro called [`serde_derive`] to</span>
 <span class="doccomment">//! automatically generate [`Deserialize`] implementations for structs and enums</span>
 <span class="doccomment">//! in your program. See the [derive section of the manual] for how to use this.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! In rare cases it may be necessary to implement [`Deserialize`] manually for</span>
 <span class="doccomment">//! some type in your program. See the [Implementing `Deserialize`] section of</span>
 <span class="doccomment">//! the manual for more about this.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Third-party crates may provide [`Deserialize`] implementations for types</span>
 <span class="doccomment">//! that they expose. For example the [`linked-hash-map`] crate provides a</span>
 <span class="doccomment">//! [`LinkedHashMap&lt;K, V&gt;`] type that is deserializable by Serde because the</span>
 <span class="doccomment">//! crate provides an implementation of [`Deserialize`] for it.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # The Deserializer trait</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`Deserializer`] implementations are provided by third-party crates, for</span>
 <span class="doccomment">//! example [`serde_json`], [`serde_yaml`] and [`bincode`].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! A partial list of well-maintained formats is given on the [Serde</span>
 <span class="doccomment">//! website][data formats].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Implementations of Deserialize provided by Serde</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! This is a slightly different set of types than what is supported for</span>
 <span class="doccomment">//! serialization. Some types can be serialized by Serde but not deserialized.</span>
 <span class="doccomment">//! One example is `OsStr`.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//!  - **Primitive types**:</span>
 <span class="doccomment">//!    - bool</span>
 <span class="doccomment">//!    - i8, i16, i32, i64, i128, isize</span>
 <span class="doccomment">//!    - u8, u16, u32, u64, u128, usize</span>
 <span class="doccomment">//!    - f32, f64</span>
 <span class="doccomment">//!    - char</span>
 <span class="doccomment">//!  - **Compound types**:</span>
 <span class="doccomment">//!    - \[T; 0\] through \[T; 32\]</span>
 <span class="doccomment">//!    - tuples up to size 16</span>
 <span class="doccomment">//!  - **Common standard library types**:</span>
 <span class="doccomment">//!    - String</span>
 <span class="doccomment">//!    - Option\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Result\&lt;T, E\&gt;</span>
 <span class="doccomment">//!    - PhantomData\&lt;T\&gt;</span>
 <span class="doccomment">//!  - **Wrapper types**:</span>
 <span class="doccomment">//!    - Box\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Box\&lt;\[T\]\&gt;</span>
 <span class="doccomment">//!    - Box\&lt;str\&gt;</span>
 <span class="doccomment">//!    - Cow\&lt;&#39;a, T\&gt;</span>
 <span class="doccomment">//!    - Cell\&lt;T\&gt;</span>
 <span class="doccomment">//!    - RefCell\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Mutex\&lt;T\&gt;</span>
 <span class="doccomment">//!    - RwLock\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Rc\&lt;T\&gt;&amp;emsp;*(if* features = [&quot;rc&quot;] *is enabled)*</span>
 <span class="doccomment">//!    - Arc\&lt;T\&gt;&amp;emsp;*(if* features = [&quot;rc&quot;] *is enabled)*</span>
 <span class="doccomment">//!  - **Collection types**:</span>
 <span class="doccomment">//!    - BTreeMap\&lt;K, V\&gt;</span>
 <span class="doccomment">//!    - BTreeSet\&lt;T\&gt;</span>
 <span class="doccomment">//!    - BinaryHeap\&lt;T\&gt;</span>
 <span class="doccomment">//!    - HashMap\&lt;K, V, H\&gt;</span>
 <span class="doccomment">//!    - HashSet\&lt;T, H\&gt;</span>
 <span class="doccomment">//!    - LinkedList\&lt;T\&gt;</span>
 <span class="doccomment">//!    - VecDeque\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Vec\&lt;T\&gt;</span>
 <span class="doccomment">//!  - **Zero-copy types**:</span>
 <span class="doccomment">//!    - &amp;str</span>
 <span class="doccomment">//!    - &amp;\[u8\]</span>
 <span class="doccomment">//!  - **FFI types**:</span>
 <span class="doccomment">//!    - CString</span>
 <span class="doccomment">//!    - Box\&lt;CStr\&gt;</span>
 <span class="doccomment">//!    - OsString</span>
 <span class="doccomment">//!  - **Miscellaneous standard library types**:</span>
 <span class="doccomment">//!    - Duration</span>
 <span class="doccomment">//!    - SystemTime</span>
 <span class="doccomment">//!    - Path</span>
 <span class="doccomment">//!    - PathBuf</span>
 <span class="doccomment">//!    - Range\&lt;T\&gt;</span>
 <span class="doccomment">//!    - RangeInclusive\&lt;T\&gt;</span>
 <span class="doccomment">//!    - Bound\&lt;T\&gt;</span>
 <span class="doccomment">//!    - num::NonZero*</span>
 <span class="doccomment">//!    - `!` *(unstable)*</span>
 <span class="doccomment">//!  - **Net types**:</span>
 <span class="doccomment">//!    - IpAddr</span>
 <span class="doccomment">//!    - Ipv4Addr</span>
 <span class="doccomment">//!    - Ipv6Addr</span>
 <span class="doccomment">//!    - SocketAddr</span>
 <span class="doccomment">//!    - SocketAddrV4</span>
 <span class="doccomment">//!    - SocketAddrV6</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [Implementing `Deserialize`]: https://serde.rs/impl-deserialize.html</span>
 <span class="doccomment">//! [`Deserialize`]: ../trait.Deserialize.html</span>
 <span class="doccomment">//! [`Deserializer`]: ../trait.Deserializer.html</span>
 <span class="doccomment">//! [`LinkedHashMap&lt;K, V&gt;`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html</span>
 <span class="doccomment">//! [`bincode`]: https://github.com/servo/bincode</span>
 <span class="doccomment">//! [`linked-hash-map`]: https://crates.io/crates/linked-hash-map</span>
 <span class="doccomment">//! [`serde_derive`]: https://crates.io/crates/serde_derive</span>
 <span class="doccomment">//! [`serde_json`]: https://github.com/serde-rs/json</span>
 <span class="doccomment">//! [`serde_yaml`]: https://github.com/dtolnay/serde-yaml</span>
 <span class="doccomment">//! [derive section of the manual]: https://serde.rs/derive.html</span>
 <span class="doccomment">//! [data formats]: https://serde.rs/#data-formats</span>

 <span class="kw">use</span> <span class="ident">lib</span>::<span class="kw-2">*</span>;

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">value</span>;

 <span class="kw">mod</span> <span class="ident">ignored_any</span>;
 <span class="kw">mod</span> <span class="ident">impls</span>;
 <span class="kw">mod</span> <span class="ident">utf8</span>;

 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="self">self</span>::ignored_any::IgnoredAny</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">no_inline</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std::error::Error</span> <span class="kw">as</span> <span class="ident">StdError</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">no_inline</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std_error::Error</span> <span class="kw">as</span> <span class="ident">StdError</span>;

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="macro">macro_rules!</span> <span class="ident">declare_error_trait</span> {
     (<span class="ident">Error</span>: <span class="ident">Sized</span> $(<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">supertrait</span>:<span class="ident">ident</span>)::<span class="op">+</span>)<span class="kw-2">*</span>) =&gt; {
         <span class="doccomment">/// The `Error` trait allows `Deserialize` implementations to create descriptive</span>
         <span class="doccomment">/// error messages belonging to the `Deserializer` against which they are</span>
         <span class="doccomment">/// currently running.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// Every `Deserializer` declares an `Error` type that encompasses both</span>
         <span class="doccomment">/// general-purpose deserialization errors as well as errors specific to the</span>
         <span class="doccomment">/// particular deserialization format. For example the `Error` type of</span>
         <span class="doccomment">/// `serde_json` can represent errors like an invalid JSON escape sequence or an</span>
         <span class="doccomment">/// unterminated string literal, in addition to the error cases that are part of</span>
         <span class="doccomment">/// this trait.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// Most deserializers should only need to provide the `Error::custom` method</span>
         <span class="doccomment">/// and inherit the default behavior for the other methods.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// # Example implementation</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// The [example data format] presented on the website shows an error</span>
         <span class="doccomment">/// type appropriate for a basic JSON data format.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
         <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Error</span>: <span class="ident">Sized</span> $(<span class="op">+</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">supertrait</span>)::<span class="op">+</span>)<span class="op">*</span> {
             <span class="doccomment">/// Raised when there is general error when deserializing a type.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The message should not be capitalized and should not end with a period.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// ```edition2018</span>
             <span class="doccomment">/// # use std::str::FromStr;</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// # struct IpAddr;</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// # impl FromStr for IpAddr {</span>
             <span class="doccomment">/// #     type Err = String;</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// #     fn from_str(_: &amp;str) -&gt; Result&lt;Self, String&gt; {</span>
             <span class="doccomment">/// #         unimplemented!()</span>
             <span class="doccomment">/// #     }</span>
             <span class="doccomment">/// # }</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// use serde::de::{self, Deserialize, Deserializer};</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// impl&lt;&#39;de&gt; Deserialize&lt;&#39;de&gt; for IpAddr {</span>
             <span class="doccomment">///     fn deserialize&lt;D&gt;(deserializer: D) -&gt; Result&lt;Self, D::Error&gt;</span>
             <span class="doccomment">///     where</span>
             <span class="doccomment">///         D: Deserializer&lt;&#39;de&gt;,</span>
             <span class="doccomment">///     {</span>
             <span class="doccomment">///         let s = String::deserialize(deserializer)?;</span>
             <span class="doccomment">///         s.parse().map_err(de::Error::custom)</span>
             <span class="doccomment">///     }</span>
             <span class="doccomment">/// }</span>
             <span class="doccomment">/// ```</span>
             <span class="kw">fn</span> <span class="ident">custom</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">msg</span>: <span class="ident">T</span>) -&gt; <span class="self">Self</span>
             <span class="kw">where</span>
                 <span class="ident">T</span>: <span class="ident">Display</span>;

             <span class="doccomment">/// Raised when a `Deserialize` receives a type different from what it was</span>
             <span class="doccomment">/// expecting.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `unexp` argument provides information about what type was received.</span>
             <span class="doccomment">/// This is the type that was present in the input file or other source data</span>
             <span class="doccomment">/// of the Deserializer.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `exp` argument provides information about what type was being</span>
             <span class="doccomment">/// expected. This is the type that is written in the program.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// For example if we try to deserialize a String out of a JSON file</span>
             <span class="doccomment">/// containing an integer, the unexpected type is the integer and the</span>
             <span class="doccomment">/// expected type is the string.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">invalid_type</span>(<span class="ident">unexp</span>: <span class="ident">Unexpected</span>, <span class="ident">exp</span>: <span class="kw-2">&amp;</span><span class="ident">Expected</span>) -&gt; <span class="self">Self</span> {
                 <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(<span class="string">&quot;invalid type: {}, expected {}&quot;</span>, <span class="ident">unexp</span>, <span class="ident">exp</span>))
             }

             <span class="doccomment">/// Raised when a `Deserialize` receives a value of the right type but that</span>
             <span class="doccomment">/// is wrong for some other reason.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `unexp` argument provides information about what value was received.</span>
             <span class="doccomment">/// This is the value that was present in the input file or other source</span>
             <span class="doccomment">/// data of the Deserializer.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `exp` argument provides information about what value was being</span>
             <span class="doccomment">/// expected. This is the type that is written in the program.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// For example if we try to deserialize a String out of some binary data</span>
             <span class="doccomment">/// that is not valid UTF-8, the unexpected value is the bytes and the</span>
             <span class="doccomment">/// expected value is a string.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">invalid_value</span>(<span class="ident">unexp</span>: <span class="ident">Unexpected</span>, <span class="ident">exp</span>: <span class="kw-2">&amp;</span><span class="ident">Expected</span>) -&gt; <span class="self">Self</span> {
                 <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(<span class="string">&quot;invalid value: {}, expected {}&quot;</span>, <span class="ident">unexp</span>, <span class="ident">exp</span>))
             }

             <span class="doccomment">/// Raised when deserializing a sequence or map and the input data contains</span>
             <span class="doccomment">/// too many or too few elements.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `len` argument is the number of elements encountered. The sequence</span>
             <span class="doccomment">/// or map may have expected more arguments or fewer arguments.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The `exp` argument provides information about what data was being</span>
             <span class="doccomment">/// expected. For example `exp` might say that a tuple of size 6 was</span>
             <span class="doccomment">/// expected.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">invalid_length</span>(<span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">exp</span>: <span class="kw-2">&amp;</span><span class="ident">Expected</span>) -&gt; <span class="self">Self</span> {
                 <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(<span class="string">&quot;invalid length {}, expected {}&quot;</span>, <span class="ident">len</span>, <span class="ident">exp</span>))
             }

             <span class="doccomment">/// Raised when a `Deserialize` enum type received a variant with an</span>
             <span class="doccomment">/// unrecognized name.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">unknown_variant</span>(<span class="ident">variant</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">expected</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>]) -&gt; <span class="self">Self</span> {
                 <span class="kw">if</span> <span class="ident">expected</span>.<span class="ident">is_empty</span>() {
                     <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(
                         <span class="string">&quot;unknown variant `{}`, there are no variants&quot;</span>,
                         <span class="ident">variant</span>
                     ))
                 } <span class="kw">else</span> {
                     <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(
                         <span class="string">&quot;unknown variant `{}`, expected {}&quot;</span>,
                         <span class="ident">variant</span>,
                         <span class="ident">OneOf</span> { <span class="ident">names</span>: <span class="ident">expected</span> }
                     ))
                 }
             }

             <span class="doccomment">/// Raised when a `Deserialize` struct type received a field with an</span>
             <span class="doccomment">/// unrecognized name.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">unknown_field</span>(<span class="ident">field</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">expected</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>]) -&gt; <span class="self">Self</span> {
                 <span class="kw">if</span> <span class="ident">expected</span>.<span class="ident">is_empty</span>() {
                     <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(
                         <span class="string">&quot;unknown field `{}`, there are no fields&quot;</span>,
                         <span class="ident">field</span>
                     ))
                 } <span class="kw">else</span> {
                     <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(
                         <span class="string">&quot;unknown field `{}`, expected {}&quot;</span>,
                         <span class="ident">field</span>,
                         <span class="ident">OneOf</span> { <span class="ident">names</span>: <span class="ident">expected</span> }
                     ))
                 }
             }

             <span class="doccomment">/// Raised when a `Deserialize` struct type expected to receive a required</span>
             <span class="doccomment">/// field with a particular name but that field was not present in the</span>
             <span class="doccomment">/// input.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">missing_field</span>(<span class="ident">field</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>) -&gt; <span class="self">Self</span> {
                 <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(<span class="string">&quot;missing field `{}`&quot;</span>, <span class="ident">field</span>))
             }

             <span class="doccomment">/// Raised when a `Deserialize` struct type received more than one of the</span>
             <span class="doccomment">/// same field.</span>
             <span class="attribute">#[<span class="ident">cold</span>]</span>
             <span class="kw">fn</span> <span class="ident">duplicate_field</span>(<span class="ident">field</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>) -&gt; <span class="self">Self</span> {
                 <span class="ident">Error::custom</span>(<span class="macro">format_args!</span>(<span class="string">&quot;duplicate field `{}`&quot;</span>, <span class="ident">field</span>))
             }
         }
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
 <span class="macro">declare_error_trait!</span>(<span class="ident">Error</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">StdError</span>);

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
 <span class="macro">declare_error_trait!</span>(<span class="ident">Error</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Display</span>);

 <span class="doccomment">/// `Unexpected` represents an unexpected invocation of any one of the `Visitor`</span>
 <span class="doccomment">/// trait methods.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is used as an argument to the `invalid_type`, `invalid_value`, and</span>
 <span class="doccomment">/// `invalid_length` methods of the `Error` trait to build error messages.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::fmt;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # use serde::de::{self, Unexpected, Visitor};</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct Example;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;&#39;de&gt; Visitor&lt;&#39;de&gt; for Example {</span>
 <span class="doccomment">/// #     type Value = ();</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// #     fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
 <span class="doccomment">/// #         write!(formatter, &quot;definitely not a boolean&quot;)</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// fn visit_bool&lt;E&gt;(self, v: bool) -&gt; Result&lt;Self::Value, E&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     E: de::Error,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     Err(de::Error::invalid_type(Unexpected::Bool(v), &amp;self))</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Unexpected</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="doccomment">/// The input contained a boolean value that was not expected.</span>
     <span class="ident">Bool</span>(<span class="ident">bool</span>),

     <span class="doccomment">/// The input contained an unsigned integer `u8`, `u16`, `u32` or `u64` that</span>
     <span class="doccomment">/// was not expected.</span>
     <span class="ident">Unsigned</span>(<span class="ident">u64</span>),

     <span class="doccomment">/// The input contained a signed integer `i8`, `i16`, `i32` or `i64` that</span>
     <span class="doccomment">/// was not expected.</span>
     <span class="ident">Signed</span>(<span class="ident">i64</span>),

     <span class="doccomment">/// The input contained a floating point `f32` or `f64` that was not</span>
     <span class="doccomment">/// expected.</span>
     <span class="ident">Float</span>(<span class="ident">f64</span>),

     <span class="doccomment">/// The input contained a `char` that was not expected.</span>
     <span class="ident">Char</span>(<span class="ident">char</span>),

     <span class="doccomment">/// The input contained a `&amp;str` or `String` that was not expected.</span>
     <span class="ident">Str</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span>),

     <span class="doccomment">/// The input contained a `&amp;[u8]` or `Vec&lt;u8&gt;` that was not expected.</span>
     <span class="ident">Bytes</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>]),

     <span class="doccomment">/// The input contained a unit `()` that was not expected.</span>
     <span class="ident">Unit</span>,

     <span class="doccomment">/// The input contained an `Option&lt;T&gt;` that was not expected.</span>
     <span class="prelude-ty">Option</span>,

     <span class="doccomment">/// The input contained a newtype struct that was not expected.</span>
     <span class="ident">NewtypeStruct</span>,

     <span class="doccomment">/// The input contained a sequence that was not expected.</span>
     <span class="ident">Seq</span>,

     <span class="doccomment">/// The input contained a map that was not expected.</span>
     <span class="ident">Map</span>,

     <span class="doccomment">/// The input contained an enum that was not expected.</span>
     <span class="ident">Enum</span>,

     <span class="doccomment">/// The input contained a unit variant that was not expected.</span>
     <span class="ident">UnitVariant</span>,

     <span class="doccomment">/// The input contained a newtype variant that was not expected.</span>
     <span class="ident">NewtypeVariant</span>,

     <span class="doccomment">/// The input contained a tuple variant that was not expected.</span>
     <span class="ident">TupleVariant</span>,

     <span class="doccomment">/// The input contained a struct variant that was not expected.</span>
     <span class="ident">StructVariant</span>,

     <span class="doccomment">/// A message stating what uncategorized thing the input contained that was</span>
     <span class="doccomment">/// not expected.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The message should be a noun or noun phrase, not capitalized and without</span>
     <span class="doccomment">/// a period. An example message is &quot;unoriginal superhero&quot;.</span>
     <span class="ident">Other</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span>),
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Unexpected</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="kw">use</span> <span class="ident"><span class="self">self</span>::Unexpected</span>::<span class="kw-2">*</span>;
         <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
             <span class="ident">Bool</span>(<span class="ident">b</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;boolean `{}`&quot;</span>, <span class="ident">b</span>),
             <span class="ident">Unsigned</span>(<span class="ident">i</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;integer `{}`&quot;</span>, <span class="ident">i</span>),
             <span class="ident">Signed</span>(<span class="ident">i</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;integer `{}`&quot;</span>, <span class="ident">i</span>),
             <span class="ident">Float</span>(<span class="ident">f</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;floating point `{}`&quot;</span>, <span class="ident">f</span>),
             <span class="ident">Char</span>(<span class="ident">c</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;character `{}`&quot;</span>, <span class="ident">c</span>),
             <span class="ident">Str</span>(<span class="ident">s</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;string {:?}&quot;</span>, <span class="ident">s</span>),
             <span class="ident">Bytes</span>(<span class="kw">_</span>) =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;byte array&quot;</span>),
             <span class="ident">Unit</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;unit value&quot;</span>),
             <span class="prelude-ty">Option</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;Option value&quot;</span>),
             <span class="ident">NewtypeStruct</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;newtype struct&quot;</span>),
             <span class="ident">Seq</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;sequence&quot;</span>),
             <span class="ident">Map</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;map&quot;</span>),
             <span class="ident">Enum</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;enum&quot;</span>),
             <span class="ident">UnitVariant</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;unit variant&quot;</span>),
             <span class="ident">NewtypeVariant</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;newtype variant&quot;</span>),
             <span class="ident">TupleVariant</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;tuple variant&quot;</span>),
             <span class="ident">StructVariant</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;struct variant&quot;</span>),
             <span class="ident">Other</span>(<span class="ident">other</span>) =&gt; <span class="ident">formatter</span>.<span class="ident">write_str</span>(<span class="ident">other</span>),
         }
     }
 }

 <span class="doccomment">/// `Expected` represents an explanation of what data a `Visitor` was expecting</span>
 <span class="doccomment">/// to receive.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is used as an argument to the `invalid_type`, `invalid_value`, and</span>
 <span class="doccomment">/// `invalid_length` methods of the `Error` trait to build error messages. The</span>
 <span class="doccomment">/// message should be a noun or noun phrase that completes the sentence &quot;This</span>
 <span class="doccomment">/// Visitor expects to receive ...&quot;, for example the message could be &quot;an</span>
 <span class="doccomment">/// integer between 0 and 64&quot;. The message should not be capitalized and should</span>
 <span class="doccomment">/// not end with a period.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Within the context of a `Visitor` implementation, the `Visitor` itself</span>
 <span class="doccomment">/// (`&amp;self`) is an implementation of this trait.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::fmt;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # use serde::de::{self, Unexpected, Visitor};</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct Example;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;&#39;de&gt; Visitor&lt;&#39;de&gt; for Example {</span>
 <span class="doccomment">/// #     type Value = ();</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// #     fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
 <span class="doccomment">/// #         write!(formatter, &quot;definitely not a boolean&quot;)</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// fn visit_bool&lt;E&gt;(self, v: bool) -&gt; Result&lt;Self::Value, E&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     E: de::Error,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     Err(de::Error::invalid_type(Unexpected::Bool(v), &amp;self))</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Outside of a `Visitor`, `&amp;&quot;...&quot;` can be used.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use serde::de::{self, Unexpected};</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # fn example&lt;E&gt;() -&gt; Result&lt;(), E&gt;</span>
 <span class="doccomment">/// # where</span>
 <span class="doccomment">/// #     E: de::Error,</span>
 <span class="doccomment">/// # {</span>
 <span class="doccomment">/// #     let v = true;</span>
 <span class="doccomment">/// return Err(de::Error::invalid_type(Unexpected::Bool(v), &amp;&quot;a negative integer&quot;));</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Expected</span> {
     <span class="doccomment">/// Format an explanation of what data was being expected. Same signature as</span>
     <span class="doccomment">/// the `Display` and `Debug` traits.</span>
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span>;
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Expected</span> <span class="kw">for</span> <span class="ident">T</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
 {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="self">self</span>.<span class="ident">expecting</span>(<span class="ident">formatter</span>)
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Expected</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="ident">formatter</span>.<span class="ident">write_str</span>(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Expected</span> <span class="op">+</span> <span class="lifetime">&#39;a</span> {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="ident">Expected::fmt</span>(<span class="self">self</span>, <span class="ident">formatter</span>)
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// A **data structure** that can be deserialized from any data format supported</span>
 <span class="doccomment">/// by Serde.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Serde provides `Deserialize` implementations for many Rust primitive and</span>
 <span class="doccomment">/// standard library types. The complete list is [here][de]. All of these can</span>
 <span class="doccomment">/// be deserialized using Serde out of the box.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Additionally, Serde provides a procedural macro called `serde_derive` to</span>
 <span class="doccomment">/// automatically generate `Deserialize` implementations for structs and enums</span>
 <span class="doccomment">/// in your program. See the [derive section of the manual][derive] for how to</span>
 <span class="doccomment">/// use this.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// In rare cases it may be necessary to implement `Deserialize` manually for</span>
 <span class="doccomment">/// some type in your program. See the [Implementing</span>
 <span class="doccomment">/// `Deserialize`][impl-deserialize] section of the manual for more about this.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Third-party crates may provide `Deserialize` implementations for types that</span>
 <span class="doccomment">/// they expose. For example the `linked-hash-map` crate provides a</span>
 <span class="doccomment">/// `LinkedHashMap&lt;K, V&gt;` type that is deserializable by Serde because the crate</span>
 <span class="doccomment">/// provides an implementation of `Deserialize` for it.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [de]: https://docs.serde.rs/serde/de/index.html</span>
 <span class="doccomment">/// [derive]: https://serde.rs/derive.html</span>
 <span class="doccomment">/// [impl-deserialize]: https://serde.rs/impl-deserialize.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by `Self` when deserialized. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// Deserialize this value from the given Serde deserializer.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// See the [Implementing `Deserialize`][impl-deserialize] section of the</span>
     <span class="doccomment">/// manual for more information about how to implement this method.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [impl-deserialize]: https://serde.rs/impl-deserialize.html</span>
     <span class="kw">fn</span> <span class="ident">deserialize</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="ident">deserializer</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>, <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Deserializes a value into `self` from the given Deserializer.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The purpose of this method is to allow the deserializer to reuse</span>
     <span class="doccomment">/// resources and avoid copies. As such, if this method returns an error,</span>
     <span class="doccomment">/// `self` will be in an indeterminate state where some parts of the struct</span>
     <span class="doccomment">/// have been overwritten. Although whatever state that is will be</span>
     <span class="doccomment">/// memory-safe.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This is generally useful when repeatedly deserializing values that</span>
     <span class="doccomment">/// are processed one at a time, where the value of `self` doesn&#39;t matter</span>
     <span class="doccomment">/// when the next deserialization occurs.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If you manually implement this, your recursive deserializations should</span>
     <span class="doccomment">/// use `deserialize_in_place`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method is stable and an official public API, but hidden from the</span>
     <span class="doccomment">/// documentation because it is almost never what newbies are looking for.</span>
     <span class="doccomment">/// Showing it in rustdoc would cause it to be featured more prominently</span>
     <span class="doccomment">/// than it deserves.</span>
     <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
     <span class="kw">fn</span> <span class="ident">deserialize_in_place</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="ident">deserializer</span>: <span class="ident">D</span>, <span class="ident">place</span>: <span class="kw-2">&amp;mut</span> <span class="self">Self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="comment">// Default implementation just delegates to `deserialize` impl.</span>
         <span class="kw-2">*</span><span class="ident">place</span> <span class="op">=</span> <span class="ident">Deserialize::deserialize</span>(<span class="ident">deserializer</span>)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="doccomment">/// A data structure that can be deserialized without borrowing any data from</span>
 <span class="doccomment">/// the deserializer.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is primarily useful for trait bounds on functions. For example a</span>
 <span class="doccomment">/// `from_str` function may be able to deserialize a data structure that borrows</span>
 <span class="doccomment">/// from the input string, but a `from_reader` function may only deserialize</span>
 <span class="doccomment">/// owned data.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use serde::de::{Deserialize, DeserializeOwned};</span>
 <span class="doccomment">/// # use std::io::{Read, Result};</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # trait Ignore {</span>
 <span class="doccomment">/// fn from_str&lt;&#39;a, T&gt;(s: &amp;&#39;a str) -&gt; Result&lt;T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     T: Deserialize&lt;&#39;a&gt;;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// fn from_reader&lt;R, T&gt;(rdr: R) -&gt; Result&lt;T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     R: Read,</span>
 <span class="doccomment">///     T: DeserializeOwned;</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The relationship between `Deserialize` and `DeserializeOwned` in trait</span>
 <span class="doccomment">/// bounds is explained in more detail on the page [Understanding deserializer</span>
 <span class="doccomment">/// lifetimes].</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">DeserializeOwned</span>: <span class="kw">for</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> {}
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">DeserializeOwned</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="kw">for</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> {}

 <span class="doccomment">/// `DeserializeSeed` is the stateful form of the `Deserialize` trait. If you</span>
 <span class="doccomment">/// ever find yourself looking for a way to pass data into a `Deserialize` impl,</span>
 <span class="doccomment">/// this trait is the way to do it.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// As one example of stateful deserialization consider deserializing a JSON</span>
 <span class="doccomment">/// array into an existing buffer. Using the `Deserialize` trait we could</span>
 <span class="doccomment">/// deserialize a JSON array into a `Vec&lt;T&gt;` but it would be a freshly allocated</span>
 <span class="doccomment">/// `Vec&lt;T&gt;`; there is no way for `Deserialize` to reuse a previously allocated</span>
 <span class="doccomment">/// buffer. Using `DeserializeSeed` instead makes this possible as in the</span>
 <span class="doccomment">/// example code below.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The canonical API for stateless deserialization looks like this:</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use serde::Deserialize;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # enum Error {}</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// fn func&lt;&#39;de, T: Deserialize&lt;&#39;de&gt;&gt;() -&gt; Result&lt;T, Error&gt;</span>
 <span class="doccomment">/// # {</span>
 <span class="doccomment">/// #     unimplemented!()</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Adjusting an API like this to support stateful deserialization is a matter</span>
 <span class="doccomment">/// of accepting a seed as input:</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use serde::de::DeserializeSeed;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # enum Error {}</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// fn func_seed&lt;&#39;de, T: DeserializeSeed&lt;&#39;de&gt;&gt;(seed: T) -&gt; Result&lt;T::Value, Error&gt;</span>
 <span class="doccomment">/// # {</span>
 <span class="doccomment">/// #     let _ = seed;</span>
 <span class="doccomment">/// #     unimplemented!()</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// In practice the majority of deserialization is stateless. An API expecting a</span>
 <span class="doccomment">/// seed can be appeased by passing `std::marker::PhantomData` as a seed in the</span>
 <span class="doccomment">/// case of stateless deserialization.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by `Self::Value` when deserialized. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Suppose we have JSON that looks like `[[1, 2], [3, 4, 5], [6]]` and we need</span>
 <span class="doccomment">/// to deserialize it into a flat representation like `vec![1, 2, 3, 4, 5, 6]`.</span>
 <span class="doccomment">/// Allocating a brand new `Vec&lt;T&gt;` for each subarray would be slow. Instead we</span>
 <span class="doccomment">/// would like to allocate a single `Vec&lt;T&gt;` and then deserialize each subarray</span>
 <span class="doccomment">/// into it. This requires stateful deserialization using the `DeserializeSeed`</span>
 <span class="doccomment">/// trait.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use std::fmt;</span>
 <span class="doccomment">/// use std::marker::PhantomData;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// use serde::de::{Deserialize, DeserializeSeed, Deserializer, SeqAccess, Visitor};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// // A DeserializeSeed implementation that uses stateful deserialization to</span>
 <span class="doccomment">/// // append array elements onto the end of an existing vector. The preexisting</span>
 <span class="doccomment">/// // state (&quot;seed&quot;) in this case is the Vec&lt;T&gt;. The `deserialize` method of</span>
 <span class="doccomment">/// // `ExtendVec` will be traversing the inner arrays of the JSON input and</span>
 <span class="doccomment">/// // appending each integer into the existing Vec.</span>
 <span class="doccomment">/// struct ExtendVec&lt;&#39;a, T: &#39;a&gt;(&amp;&#39;a mut Vec&lt;T&gt;);</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl&lt;&#39;de, &#39;a, T&gt; DeserializeSeed&lt;&#39;de&gt; for ExtendVec&lt;&#39;a, T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     T: Deserialize&lt;&#39;de&gt;,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     // The return type of the `deserialize` method. This implementation</span>
 <span class="doccomment">///     // appends onto an existing vector but does not create any new data</span>
 <span class="doccomment">///     // structure, so the return type is ().</span>
 <span class="doccomment">///     type Value = ();</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn deserialize&lt;D&gt;(self, deserializer: D) -&gt; Result&lt;Self::Value, D::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         D: Deserializer&lt;&#39;de&gt;,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         // Visitor implementation that will walk an inner array of the JSON</span>
 <span class="doccomment">///         // input.</span>
 <span class="doccomment">///         struct ExtendVecVisitor&lt;&#39;a, T: &#39;a&gt;(&amp;&#39;a mut Vec&lt;T&gt;);</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///         impl&lt;&#39;de, &#39;a, T&gt; Visitor&lt;&#39;de&gt; for ExtendVecVisitor&lt;&#39;a, T&gt;</span>
 <span class="doccomment">///         where</span>
 <span class="doccomment">///             T: Deserialize&lt;&#39;de&gt;,</span>
 <span class="doccomment">///         {</span>
 <span class="doccomment">///             type Value = ();</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///             fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
 <span class="doccomment">///                 write!(formatter, &quot;an array of integers&quot;)</span>
 <span class="doccomment">///             }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///             fn visit_seq&lt;A&gt;(self, mut seq: A) -&gt; Result&lt;(), A::Error&gt;</span>
 <span class="doccomment">///             where</span>
 <span class="doccomment">///                 A: SeqAccess&lt;&#39;de&gt;,</span>
 <span class="doccomment">///             {</span>
 <span class="doccomment">///                 // Visit each element in the inner array and push it onto</span>
 <span class="doccomment">///                 // the existing vector.</span>
 <span class="doccomment">///                 while let Some(elem) = seq.next_element()? {</span>
 <span class="doccomment">///                     self.0.push(elem);</span>
 <span class="doccomment">///                 }</span>
 <span class="doccomment">///                 Ok(())</span>
 <span class="doccomment">///             }</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///         deserializer.deserialize_seq(ExtendVecVisitor(self.0))</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// // Visitor implementation that will walk the outer array of the JSON input.</span>
 <span class="doccomment">/// struct FlattenedVecVisitor&lt;T&gt;(PhantomData&lt;T&gt;);</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl&lt;&#39;de, T&gt; Visitor&lt;&#39;de&gt; for FlattenedVecVisitor&lt;T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     T: Deserialize&lt;&#39;de&gt;,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     // This Visitor constructs a single Vec&lt;T&gt; to hold the flattened</span>
 <span class="doccomment">///     // contents of the inner arrays.</span>
 <span class="doccomment">///     type Value = Vec&lt;T&gt;;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
 <span class="doccomment">///         write!(formatter, &quot;an array of arrays&quot;)</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn visit_seq&lt;A&gt;(self, mut seq: A) -&gt; Result&lt;Vec&lt;T&gt;, A::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         A: SeqAccess&lt;&#39;de&gt;,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         // Create a single Vec to hold the flattened contents.</span>
 <span class="doccomment">///         let mut vec = Vec::new();</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///         // Each iteration through this loop is one inner array.</span>
 <span class="doccomment">///         while let Some(()) = seq.next_element_seed(ExtendVec(&amp;mut vec))? {</span>
 <span class="doccomment">///             // Nothing to do; inner array has been appended into `vec`.</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///         // Return the finished vec.</span>
 <span class="doccomment">///         Ok(vec)</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # fn example&lt;&#39;de, D&gt;(deserializer: D) -&gt; Result&lt;(), D::Error&gt;</span>
 <span class="doccomment">/// # where</span>
 <span class="doccomment">/// #     D: Deserializer&lt;&#39;de&gt;,</span>
 <span class="doccomment">/// # {</span>
 <span class="doccomment">/// let visitor = FlattenedVecVisitor(PhantomData);</span>
 <span class="doccomment">/// let flattened: Vec&lt;u64&gt; = deserializer.deserialize_seq(visitor)?;</span>
 <span class="doccomment">/// #     Ok(())</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// ```</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The type produced by using this seed.</span>
     <span class="kw">type</span> <span class="ident">Value</span>;

     <span class="doccomment">/// Equivalent to the more common `Deserialize::deserialize` method, except</span>
     <span class="doccomment">/// with some initial piece of data (the seed) passed in.</span>
     <span class="kw">fn</span> <span class="ident">deserialize</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">deserializer</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
 {
     <span class="kw">type</span> <span class="ident">Value</span> <span class="op">=</span> <span class="ident">T</span>;

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">deserialize</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">deserializer</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="ident">T::deserialize</span>(<span class="ident">deserializer</span>)
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// A **data format** that can deserialize any data structure supported by</span>
 <span class="doccomment">/// Serde.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The role of this trait is to define the deserialization half of the [Serde</span>
 <span class="doccomment">/// data model], which is a way to categorize every Rust data type into one of</span>
 <span class="doccomment">/// 29 possible types. Each method of the `Deserializer` trait corresponds to one</span>
 <span class="doccomment">/// of the types of the data model.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Implementations of `Deserialize` map themselves into this data model by</span>
 <span class="doccomment">/// passing to the `Deserializer` a `Visitor` implementation that can receive</span>
 <span class="doccomment">/// these various types.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The types that make up the Serde data model are:</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///  - **14 primitive types**</span>
 <span class="doccomment">///    - bool</span>
 <span class="doccomment">///    - i8, i16, i32, i64, i128</span>
 <span class="doccomment">///    - u8, u16, u32, u64, u128</span>
 <span class="doccomment">///    - f32, f64</span>
 <span class="doccomment">///    - char</span>
 <span class="doccomment">///  - **string**</span>
 <span class="doccomment">///    - UTF-8 bytes with a length and no null terminator.</span>
 <span class="doccomment">///    - When serializing, all strings are handled equally. When deserializing,</span>
 <span class="doccomment">///      there are three flavors of strings: transient, owned, and borrowed.</span>
 <span class="doccomment">///  - **byte array** - \[u8\]</span>
 <span class="doccomment">///    - Similar to strings, during deserialization byte arrays can be</span>
 <span class="doccomment">///      transient, owned, or borrowed.</span>
 <span class="doccomment">///  - **option**</span>
 <span class="doccomment">///    - Either none or some value.</span>
 <span class="doccomment">///  - **unit**</span>
 <span class="doccomment">///    - The type of `()` in Rust. It represents an anonymous value containing</span>
 <span class="doccomment">///      no data.</span>
 <span class="doccomment">///  - **unit_struct**</span>
 <span class="doccomment">///    - For example `struct Unit` or `PhantomData&lt;T&gt;`. It represents a named</span>
 <span class="doccomment">///      value containing no data.</span>
 <span class="doccomment">///  - **unit_variant**</span>
 <span class="doccomment">///    - For example the `E::A` and `E::B` in `enum E { A, B }`.</span>
 <span class="doccomment">///  - **newtype_struct**</span>
 <span class="doccomment">///    - For example `struct Millimeters(u8)`.</span>
 <span class="doccomment">///  - **newtype_variant**</span>
 <span class="doccomment">///    - For example the `E::N` in `enum E { N(u8) }`.</span>
 <span class="doccomment">///  - **seq**</span>
 <span class="doccomment">///    - A variably sized heterogeneous sequence of values, for example `Vec&lt;T&gt;`</span>
 <span class="doccomment">///      or `HashSet&lt;T&gt;`. When serializing, the length may or may not be known</span>
 <span class="doccomment">///      before iterating through all the data. When deserializing, the length</span>
 <span class="doccomment">///      is determined by looking at the serialized data.</span>
 <span class="doccomment">///  - **tuple**</span>
 <span class="doccomment">///    - A statically sized heterogeneous sequence of values for which the</span>
 <span class="doccomment">///      length will be known at deserialization time without looking at the</span>
 <span class="doccomment">///      serialized data, for example `(u8,)` or `(String, u64, Vec&lt;T&gt;)` or</span>
 <span class="doccomment">///      `[u64; 10]`.</span>
 <span class="doccomment">///  - **tuple_struct**</span>
 <span class="doccomment">///    - A named tuple, for example `struct Rgb(u8, u8, u8)`.</span>
 <span class="doccomment">///  - **tuple_variant**</span>
 <span class="doccomment">///    - For example the `E::T` in `enum E { T(u8, u8) }`.</span>
 <span class="doccomment">///  - **map**</span>
 <span class="doccomment">///    - A heterogeneous key-value pairing, for example `BTreeMap&lt;K, V&gt;`.</span>
 <span class="doccomment">///  - **struct**</span>
 <span class="doccomment">///    - A heterogeneous key-value pairing in which the keys are strings and</span>
 <span class="doccomment">///      will be known at deserialization time without looking at the serialized</span>
 <span class="doccomment">///      data, for example `struct S { r: u8, g: u8, b: u8 }`.</span>
 <span class="doccomment">///  - **struct_variant**</span>
 <span class="doccomment">///    - For example the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `Deserializer` trait supports two entry point styles which enables</span>
 <span class="doccomment">/// different kinds of deserialization.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// 1. The `deserialize` method. Self-describing data formats like JSON are able</span>
 <span class="doccomment">///    to look at the serialized data and tell what it represents. For example</span>
 <span class="doccomment">///    the JSON deserializer may see an opening curly brace (`{`) and know that</span>
 <span class="doccomment">///    it is seeing a map. If the data format supports</span>
 <span class="doccomment">///    `Deserializer::deserialize_any`, it will drive the Visitor using whatever</span>
 <span class="doccomment">///    type it sees in the input. JSON uses this approach when deserializing</span>
 <span class="doccomment">///    `serde_json::Value` which is an enum that can represent any JSON</span>
 <span class="doccomment">///    document. Without knowing what is in a JSON document, we can deserialize</span>
 <span class="doccomment">///    it to `serde_json::Value` by going through</span>
 <span class="doccomment">///    `Deserializer::deserialize_any`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// 2. The various `deserialize_*` methods. Non-self-describing formats like</span>
 <span class="doccomment">///    Bincode need to be told what is in the input in order to deserialize it.</span>
 <span class="doccomment">///    The `deserialize_*` methods are hints to the deserializer for how to</span>
 <span class="doccomment">///    interpret the next piece of input. Non-self-describing formats are not</span>
 <span class="doccomment">///    able to deserialize something like `serde_json::Value` which relies on</span>
 <span class="doccomment">///    `Deserializer::deserialize_any`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// When implementing `Deserialize`, you should avoid relying on</span>
 <span class="doccomment">/// `Deserializer::deserialize_any` unless you need to be told by the</span>
 <span class="doccomment">/// Deserializer what type is in the input. Know that relying on</span>
 <span class="doccomment">/// `Deserializer::deserialize_any` means your data type will be able to</span>
 <span class="doccomment">/// deserialize from self-describing formats only, ruling out Bincode and many</span>
 <span class="doccomment">/// others.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Serde data model]: https://serde.rs/data-model.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed from the input when deserializing. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example implementation</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The [example data format] presented on the website contains example code for</span>
 <span class="doccomment">/// a basic JSON `Deserializer`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The error type that can be returned if some error occurs during</span>
     <span class="doccomment">/// deserialization.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Require the `Deserializer` to figure out how to drive the visitor based</span>
     <span class="doccomment">/// on what data type is in the input.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// When implementing `Deserialize`, you should avoid relying on</span>
     <span class="doccomment">/// `Deserializer::deserialize_any` unless you need to be told by the</span>
     <span class="doccomment">/// Deserializer what type is in the input. Know that relying on</span>
     <span class="doccomment">/// `Deserializer::deserialize_any` means your data type will be able to</span>
     <span class="doccomment">/// deserialize from self-describing formats only, ruling out Bincode and</span>
     <span class="doccomment">/// many others.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_any</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `bool` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_bool</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `i8` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_i8</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `i16` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_i16</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `i32` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_i32</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `i64` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_i64</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `i128` value.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// This method is available only on Rust compiler versions &gt;=1.26. The</span>
         <span class="doccomment">/// default behavior unconditionally returns an error.</span>
         <span class="kw">fn</span> <span class="ident">deserialize_i128</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
         <span class="kw">where</span>
             <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>
         {
             <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">visitor</span>;
             <span class="prelude-val">Err</span>(<span class="ident">Error::custom</span>(<span class="string">&quot;i128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `u8` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_u8</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `u16` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_u16</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `u32` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_u32</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `u64` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_u64</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// Hint that the `Deserialize` type is expecting an `u128` value.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// This method is available only on Rust compiler versions &gt;=1.26. The</span>
         <span class="doccomment">/// default behavior unconditionally returns an error.</span>
         <span class="kw">fn</span> <span class="ident">deserialize_u128</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
         <span class="kw">where</span>
             <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>
         {
             <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">visitor</span>;
             <span class="prelude-val">Err</span>(<span class="ident">Error::custom</span>(<span class="string">&quot;u128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `f32` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_f32</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `f64` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_f64</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a `char` value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_char</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a string value and does</span>
     <span class="doccomment">/// not benefit from taking ownership of buffered data owned by the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the `Visitor` would benefit from taking ownership of `String` data,</span>
     <span class="doccomment">/// indicate this to the `Deserializer` by using `deserialize_string`</span>
     <span class="doccomment">/// instead.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_str</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a string value and would</span>
     <span class="doccomment">/// benefit from taking ownership of buffered data owned by the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the `Visitor` would not benefit from taking ownership of `String`</span>
     <span class="doccomment">/// data, indicate that to the `Deserializer` by using `deserialize_str`</span>
     <span class="doccomment">/// instead.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_string</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a byte array and does not</span>
     <span class="doccomment">/// benefit from taking ownership of buffered data owned by the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the `Visitor` would benefit from taking ownership of `Vec&lt;u8&gt;` data,</span>
     <span class="doccomment">/// indicate this to the `Deserializer` by using `deserialize_byte_buf`</span>
     <span class="doccomment">/// instead.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_bytes</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a byte array and would</span>
     <span class="doccomment">/// benefit from taking ownership of buffered data owned by the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the `Visitor` would not benefit from taking ownership of `Vec&lt;u8&gt;`</span>
     <span class="doccomment">/// data, indicate that to the `Deserializer` by using `deserialize_bytes`</span>
     <span class="doccomment">/// instead.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_byte_buf</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an optional value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This allows deserializers that encode an optional value as a nullable</span>
     <span class="doccomment">/// value to convert the null value into `None` and a regular value into</span>
     <span class="doccomment">/// `Some(value)`.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_option</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a unit value.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_unit</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a unit struct with a</span>
     <span class="doccomment">/// particular name.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_unit_struct</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a newtype struct with a</span>
     <span class="doccomment">/// particular name.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_newtype_struct</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a sequence of values.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_seq</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a sequence of values and</span>
     <span class="doccomment">/// knows how many values there are without looking at the serialized data.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_tuple</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a tuple struct with a</span>
     <span class="doccomment">/// particular name and number of fields.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_tuple_struct</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">len</span>: <span class="ident">usize</span>,
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a map of key-value pairs.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_map</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting a struct with a particular</span>
     <span class="doccomment">/// name and fields.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_struct</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">fields</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>],
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting an enum value with a</span>
     <span class="doccomment">/// particular name and possible variants.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_enum</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">variants</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>],
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type is expecting the name of a struct</span>
     <span class="doccomment">/// field or the discriminant of an enum variant.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_identifier</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Hint that the `Deserialize` type needs to deserialize a value whose type</span>
     <span class="doccomment">/// doesn&#39;t matter because it is ignored.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Deserializers for non-self-describing formats may not support this mode.</span>
     <span class="kw">fn</span> <span class="ident">deserialize_ignored_any</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Determine whether `Deserialize` implementations should expect to</span>
     <span class="doccomment">/// deserialize their human-readable form.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Some types have a human-readable form that may be somewhat expensive to</span>
     <span class="doccomment">/// construct, as well as a binary form that is compact and efficient.</span>
     <span class="doccomment">/// Generally text-based formats like JSON and YAML will prefer to use the</span>
     <span class="doccomment">/// human-readable one and binary formats like Bincode will prefer the</span>
     <span class="doccomment">/// compact one.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use std::ops::Add;</span>
     <span class="doccomment">/// # use std::str::FromStr;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct Timestamp;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Timestamp {</span>
     <span class="doccomment">/// #     const EPOCH: Timestamp = Timestamp;</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl FromStr for Timestamp {</span>
     <span class="doccomment">/// #     type Err = String;</span>
     <span class="doccomment">/// #     fn from_str(_: &amp;str) -&gt; Result&lt;Self, Self::Err&gt; {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct Duration;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Duration {</span>
     <span class="doccomment">/// #     fn seconds(_: u64) -&gt; Self { unimplemented!() }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Add&lt;Duration&gt; for Timestamp {</span>
     <span class="doccomment">/// #     type Output = Timestamp;</span>
     <span class="doccomment">/// #     fn add(self, _: Duration) -&gt; Self::Output {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::de::{self, Deserialize, Deserializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl&lt;&#39;de&gt; Deserialize&lt;&#39;de&gt; for Timestamp {</span>
     <span class="doccomment">///     fn deserialize&lt;D&gt;(deserializer: D) -&gt; Result&lt;Self, D::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         D: Deserializer&lt;&#39;de&gt;,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         if deserializer.is_human_readable() {</span>
     <span class="doccomment">///             // Deserialize from a human-readable string like &quot;2015-05-15T17:01:00Z&quot;.</span>
     <span class="doccomment">///             let s = String::deserialize(deserializer)?;</span>
     <span class="doccomment">///             Timestamp::from_str(&amp;s).map_err(de::Error::custom)</span>
     <span class="doccomment">///         } else {</span>
     <span class="doccomment">///             // Deserialize from a compact binary representation, seconds since</span>
     <span class="doccomment">///             // the Unix epoch.</span>
     <span class="doccomment">///             let n = u64::deserialize(deserializer)?;</span>
     <span class="doccomment">///             Ok(Timestamp::EPOCH + Duration::seconds(n))</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation of this method returns `true`. Data formats</span>
     <span class="doccomment">/// may override this to `false` to request a compact form for types that</span>
     <span class="doccomment">/// support one. Note that modifying this method to change a format from</span>
     <span class="doccomment">/// human-readable to compact or vice versa should be regarded as a breaking</span>
     <span class="doccomment">/// change, as a value serialized in human-readable mode is not required to</span>
     <span class="doccomment">/// deserialize from the same data in compact mode.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">is_human_readable</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
         <span class="bool-val">true</span>
     }

     <span class="comment">// Not public API.</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">serde_derive</span>, <span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>)))]</span>
     <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
     <span class="kw">fn</span> <span class="ident">__deserialize_content</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="kw">_</span>: <span class="ident">::actually_private::T</span>,
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">::private::de::Content</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">Value</span> <span class="op">=</span> <span class="ident">::private::de::Content</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">deserialize_any</span>(<span class="ident">visitor</span>)
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// This trait represents a visitor that walks through a deserializer.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the requirement for lifetime of data</span>
 <span class="doccomment">/// that may be borrowed by `Self::Value`. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::fmt;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # use serde::de::{self, Unexpected, Visitor};</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// /// A visitor that deserializes a long string - a string containing at least</span>
 <span class="doccomment">/// /// some minimum number of bytes.</span>
 <span class="doccomment">/// struct LongString {</span>
 <span class="doccomment">///     min: usize,</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl&lt;&#39;de&gt; Visitor&lt;&#39;de&gt; for LongString {</span>
 <span class="doccomment">///     type Value = String;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
 <span class="doccomment">///         write!(formatter, &quot;a string containing at least {} bytes&quot;, self.min)</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn visit_str&lt;E&gt;(self, s: &amp;str) -&gt; Result&lt;Self::Value, E&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         E: de::Error,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         if s.len() &gt;= self.min {</span>
 <span class="doccomment">///             Ok(s.to_owned())</span>
 <span class="doccomment">///         } else {</span>
 <span class="doccomment">///             Err(de::Error::invalid_value(Unexpected::Str(s), &amp;self))</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The value produced by this visitor.</span>
     <span class="kw">type</span> <span class="ident">Value</span>;

     <span class="doccomment">/// Format a message stating what data this Visitor expects to receive.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This is used in error messages. The message should complete the sentence</span>
     <span class="doccomment">/// &quot;This Visitor expects to receive ...&quot;, for example the message could be</span>
     <span class="doccomment">/// &quot;an integer between 0 and 64&quot;. The message should not be capitalized and</span>
     <span class="doccomment">/// should not end with a period.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use std::fmt;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct S {</span>
     <span class="doccomment">/// #     max: usize,</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;de&gt; serde::de::Visitor&lt;&#39;de&gt; for S {</span>
     <span class="doccomment">/// #     type Value = ();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
     <span class="doccomment">///     write!(formatter, &quot;an integer between 0 and {}&quot;, self.max)</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">expecting</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span>;

     <span class="doccomment">/// The input contains a boolean.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_bool</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">bool</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Bool</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains an `i8`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_i64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_i64`]: #method.visit_i64</span>
     <span class="kw">fn</span> <span class="ident">visit_i8</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i8</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_i64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">i64</span>)
     }

     <span class="doccomment">/// The input contains an `i16`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_i64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_i64`]: #method.visit_i64</span>
     <span class="kw">fn</span> <span class="ident">visit_i16</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i16</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_i64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">i64</span>)
     }

     <span class="doccomment">/// The input contains an `i32`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_i64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_i64`]: #method.visit_i64</span>
     <span class="kw">fn</span> <span class="ident">visit_i32</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i32</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_i64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">i64</span>)
     }

     <span class="doccomment">/// The input contains an `i64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_i64</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i64</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Signed</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// The input contains a `i128`.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// This method is available only on Rust compiler versions &gt;=1.26. The</span>
         <span class="doccomment">/// default implementation fails with a type error.</span>
         <span class="kw">fn</span> <span class="ident">visit_i128</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i128</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
         <span class="kw">where</span>
             <span class="ident">E</span>: <span class="ident">Error</span>,
         {
             <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">v</span>;
             <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Other</span>(<span class="string">&quot;i128&quot;</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
         }
     }

     <span class="doccomment">/// The input contains a `u8`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_u64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_u64`]: #method.visit_u64</span>
     <span class="kw">fn</span> <span class="ident">visit_u8</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u8</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_u64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u64</span>)
     }

     <span class="doccomment">/// The input contains a `u16`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_u64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_u64`]: #method.visit_u64</span>
     <span class="kw">fn</span> <span class="ident">visit_u16</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u16</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_u64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u64</span>)
     }

     <span class="doccomment">/// The input contains a `u32`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_u64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_u64`]: #method.visit_u64</span>
     <span class="kw">fn</span> <span class="ident">visit_u32</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u32</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_u64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u64</span>)
     }

     <span class="doccomment">/// The input contains a `u64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_u64</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u64</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Unsigned</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// The input contains a `u128`.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// This method is available only on Rust compiler versions &gt;=1.26. The</span>
         <span class="doccomment">/// default implementation fails with a type error.</span>
         <span class="kw">fn</span> <span class="ident">visit_u128</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u128</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
         <span class="kw">where</span>
             <span class="ident">E</span>: <span class="ident">Error</span>,
         {
             <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">v</span>;
             <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Other</span>(<span class="string">&quot;u128&quot;</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
         }
     }

     <span class="doccomment">/// The input contains an `f32`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_f64`].</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_f64`]: #method.visit_f64</span>
     <span class="kw">fn</span> <span class="ident">visit_f32</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">f32</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_f64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">f64</span>)
     }

     <span class="doccomment">/// The input contains an `f64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_f64</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">f64</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Float</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a `char`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to [`visit_str`] as a one-character</span>
     <span class="doccomment">/// string.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`visit_str`]: #method.visit_str</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">visit_char</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">char</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_str</span>(<span class="ident">utf8::encode</span>(<span class="ident">v</span>).<span class="ident">as_str</span>())
     }

     <span class="doccomment">/// The input contains a string. The lifetime of the string is ephemeral and</span>
     <span class="doccomment">/// it may be destroyed after this method returns.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method allows the `Deserializer` to avoid a copy by retaining</span>
     <span class="doccomment">/// ownership of any buffered data. `Deserialize` implementations that do</span>
     <span class="doccomment">/// not benefit from taking ownership of `String` data should indicate that</span>
     <span class="doccomment">/// to the deserializer by using `Deserializer::deserialize_str` rather than</span>
     <span class="doccomment">/// `Deserializer::deserialize_string`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// It is never correct to implement `visit_string` without implementing</span>
     <span class="doccomment">/// `visit_str`. Implement neither, both, or just `visit_str`.</span>
     <span class="kw">fn</span> <span class="ident">visit_str</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Str</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a string that lives at least as long as the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This enables zero-copy deserialization of strings in some formats. For</span>
     <span class="doccomment">/// example JSON input containing the JSON string `&quot;borrowed&quot;` can be</span>
     <span class="doccomment">/// deserialized with zero copying into a `&amp;&#39;a str` as long as the input</span>
     <span class="doccomment">/// data outlives `&#39;a`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to `visit_str`.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">visit_borrowed_str</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;de</span> <span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_str</span>(<span class="ident">v</span>)
     }

     <span class="doccomment">/// The input contains a string and ownership of the string is being given</span>
     <span class="doccomment">/// to the `Visitor`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method allows the `Visitor` to avoid a copy by taking ownership of</span>
     <span class="doccomment">/// a string created by the `Deserializer`. `Deserialize` implementations</span>
     <span class="doccomment">/// that benefit from taking ownership of `String` data should indicate that</span>
     <span class="doccomment">/// to the deserializer by using `Deserializer::deserialize_string` rather</span>
     <span class="doccomment">/// than `Deserializer::deserialize_str`, although not every deserializer</span>
     <span class="doccomment">/// will honor such a request.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// It is never correct to implement `visit_string` without implementing</span>
     <span class="doccomment">/// `visit_str`. Implement neither, both, or just `visit_str`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to `visit_str` and then drops the</span>
     <span class="doccomment">/// `String`.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>))]</span>
     <span class="kw">fn</span> <span class="ident">visit_string</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">String</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_str</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)
     }

     <span class="doccomment">/// The input contains a byte array. The lifetime of the byte array is</span>
     <span class="doccomment">/// ephemeral and it may be destroyed after this method returns.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method allows the `Deserializer` to avoid a copy by retaining</span>
     <span class="doccomment">/// ownership of any buffered data. `Deserialize` implementations that do</span>
     <span class="doccomment">/// not benefit from taking ownership of `Vec&lt;u8&gt;` data should indicate that</span>
     <span class="doccomment">/// to the deserializer by using `Deserializer::deserialize_bytes` rather</span>
     <span class="doccomment">/// than `Deserializer::deserialize_byte_buf`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// It is never correct to implement `visit_byte_buf` without implementing</span>
     <span class="doccomment">/// `visit_bytes`. Implement neither, both, or just `visit_bytes`.</span>
     <span class="kw">fn</span> <span class="ident">visit_bytes</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">v</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Bytes</span>(<span class="ident">v</span>), <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a byte array that lives at least as long as the</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This enables zero-copy deserialization of bytes in some formats. For</span>
     <span class="doccomment">/// example Bincode data containing bytes can be deserialized with zero</span>
     <span class="doccomment">/// copying into a `&amp;&#39;a [u8]` as long as the input data outlives `&#39;a`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to `visit_bytes`.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">visit_borrowed_bytes</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;de</span> [<span class="ident">u8</span>]) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_bytes</span>(<span class="ident">v</span>)
     }

     <span class="doccomment">/// The input contains a byte array and ownership of the byte array is being</span>
     <span class="doccomment">/// given to the `Visitor`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method allows the `Visitor` to avoid a copy by taking ownership of</span>
     <span class="doccomment">/// a byte buffer created by the `Deserializer`. `Deserialize`</span>
     <span class="doccomment">/// implementations that benefit from taking ownership of `Vec&lt;u8&gt;` data</span>
     <span class="doccomment">/// should indicate that to the deserializer by using</span>
     <span class="doccomment">/// `Deserializer::deserialize_byte_buf` rather than</span>
     <span class="doccomment">/// `Deserializer::deserialize_bytes`, although not every deserializer will</span>
     <span class="doccomment">/// honor such a request.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// It is never correct to implement `visit_byte_buf` without implementing</span>
     <span class="doccomment">/// `visit_bytes`. Implement neither, both, or just `visit_bytes`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation forwards to `visit_bytes` and then drops the</span>
     <span class="doccomment">/// `Vec&lt;u8&gt;`.</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>))]</span>
     <span class="kw">fn</span> <span class="ident">visit_byte_buf</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="self">self</span>.<span class="ident">visit_bytes</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)
     }

     <span class="doccomment">/// The input contains an optional that is absent.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_none</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Option</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains an optional that is present.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_some</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">deserializer</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">deserializer</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Option</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a unit `()`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_unit</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">E</span>: <span class="ident">Error</span>,
     {
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Unit</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a newtype struct.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The content of the newtype struct may be read from the given</span>
     <span class="doccomment">/// `Deserializer`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_newtype_struct</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">deserializer</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">D::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">deserializer</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::NewtypeStruct</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a sequence of elements.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_seq</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">seq</span>: <span class="ident">A</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">A::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">A</span>: <span class="ident">SeqAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">seq</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Seq</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains a key-value map.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_map</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">map</span>: <span class="ident">A</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">A::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">A</span>: <span class="ident">MapAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">map</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Map</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="doccomment">/// The input contains an enum.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation fails with a type error.</span>
     <span class="kw">fn</span> <span class="ident">visit_enum</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">data</span>: <span class="ident">A</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">A::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">A</span>: <span class="ident">EnumAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">data</span>;
         <span class="prelude-val">Err</span>(<span class="ident">Error::invalid_type</span>(<span class="ident">Unexpected::Enum</span>, <span class="kw-2">&amp;</span><span class="self">self</span>))
     }

     <span class="comment">// Used when deserializing a flattened Option field. Not public API.</span>
     <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
     <span class="kw">fn</span> <span class="ident">__private_visit_untagged_option</span><span class="op">&lt;</span><span class="ident">D</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="kw">_</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Value</span>, ()<span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="prelude-val">Err</span>(())
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// Provides a `Visitor` access to each element of a sequence in the input.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is a trait that a `Deserializer` passes to a `Visitor` implementation,</span>
 <span class="doccomment">/// which deserializes each item in a sequence.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by deserialized sequence elements. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example implementation</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The [example data format] presented on the website demonstrates an</span>
 <span class="doccomment">/// implementation of `SeqAccess` for a basic JSON data format.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">SeqAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> {
     <span class="doccomment">/// The error type that can be returned if some error occurs during</span>
     <span class="doccomment">/// deserialization.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// This returns `Ok(Some(value))` for the next value in the sequence, or</span>
     <span class="doccomment">/// `Ok(None)` if there are no more remaining items.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use</span>
     <span class="doccomment">/// `SeqAccess::next_element` instead.</span>
     <span class="kw">fn</span> <span class="ident">next_element_seed</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T::Value</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// This returns `Ok(Some(value))` for the next value in the sequence, or</span>
     <span class="doccomment">/// `Ok(None)` if there are no more remaining items.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `SeqAccess` implementations should not override the default behavior.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_element</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">next_element_seed</span>(<span class="ident">PhantomData</span>)
     }

     <span class="doccomment">/// Returns the number of elements remaining in the sequence, if known.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
         <span class="prelude-val">None</span>
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, <span class="ident">A</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> <span class="ident">SeqAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">A</span>
 <span class="kw">where</span>
     <span class="ident">A</span>: <span class="ident">SeqAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
 {
     <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">A::Error</span>;

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_element_seed</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T::Value</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_element_seed</span>(<span class="ident">seed</span>)
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_element</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_element</span>()
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">size_hint</span>()
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// Provides a `Visitor` access to each entry of a map in the input.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is a trait that a `Deserializer` passes to a `Visitor` implementation.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by deserialized map entries. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example implementation</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The [example data format] presented on the website demonstrates an</span>
 <span class="doccomment">/// implementation of `MapAccess` for a basic JSON data format.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">MapAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> {
     <span class="doccomment">/// The error type that can be returned if some error occurs during</span>
     <span class="doccomment">/// deserialization.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)`</span>
     <span class="doccomment">/// if there are no more remaining entries.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use</span>
     <span class="doccomment">/// `MapAccess::next_key` or `MapAccess::next_entry` instead.</span>
     <span class="kw">fn</span> <span class="ident">next_key_seed</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">K</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">K::Value</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// This returns a `Ok(value)` for the next value in the map.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use</span>
     <span class="doccomment">/// `MapAccess::next_value` instead.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Calling `next_value_seed` before `next_key_seed` is incorrect and is</span>
     <span class="doccomment">/// allowed to panic or return bogus results.</span>
     <span class="kw">fn</span> <span class="ident">next_value_seed</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// This returns `Ok(Some((key, value)))` for the next (key-value) pair in</span>
     <span class="doccomment">/// the map, or `Ok(None)` if there are no more remaining items.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `MapAccess` implementations should override the default behavior if a</span>
     <span class="doccomment">/// more efficient implementation is possible.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use</span>
     <span class="doccomment">/// `MapAccess::next_entry` instead.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_entry_seed</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>(
         <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
         <span class="ident">kseed</span>: <span class="ident">K</span>,
         <span class="ident">vseed</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">K::Value</span>, <span class="ident">V::Value</span>)<span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
         <span class="ident">V</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="kw">match</span> <span class="macro">try!</span>(<span class="self">self</span>.<span class="ident">next_key_seed</span>(<span class="ident">kseed</span>)) {
             <span class="prelude-val">Some</span>(<span class="ident">key</span>) =&gt; {
                 <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">try!</span>(<span class="self">self</span>.<span class="ident">next_value_seed</span>(<span class="ident">vseed</span>));
                 <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>((<span class="ident">key</span>, <span class="ident">value</span>)))
             }
             <span class="prelude-val">None</span> =&gt; <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
         }
     }

     <span class="doccomment">/// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)`</span>
     <span class="doccomment">/// if there are no more remaining entries.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `MapAccess` implementations should not override the default behavior.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_key</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">next_key_seed</span>(<span class="ident">PhantomData</span>)
     }

     <span class="doccomment">/// This returns a `Ok(value)` for the next value in the map.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `MapAccess` implementations should not override the default behavior.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Calling `next_value` before `next_key` is incorrect and is allowed to</span>
     <span class="doccomment">/// panic or return bogus results.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_value</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">next_value_seed</span>(<span class="ident">PhantomData</span>)
     }

     <span class="doccomment">/// This returns `Ok(Some((key, value)))` for the next (key-value) pair in</span>
     <span class="doccomment">/// the map, or `Ok(None)` if there are no more remaining items.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `MapAccess` implementations should not override the default behavior.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_entry</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
         <span class="ident">V</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">next_entry_seed</span>(<span class="ident">PhantomData</span>, <span class="ident">PhantomData</span>)
     }

     <span class="doccomment">/// Returns the number of entries remaining in the map, if known.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
         <span class="prelude-val">None</span>
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="lifetime">&#39;a</span>, <span class="ident">A</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> <span class="ident">MapAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">A</span>
 <span class="kw">where</span>
     <span class="ident">A</span>: <span class="ident">MapAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
 {
     <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">A::Error</span>;

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_key_seed</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">K</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">K::Value</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_key_seed</span>(<span class="ident">seed</span>)
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_value_seed</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_value_seed</span>(<span class="ident">seed</span>)
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_entry_seed</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>(
         <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
         <span class="ident">kseed</span>: <span class="ident">K</span>,
         <span class="ident">vseed</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">K::Value</span>, <span class="ident">V::Value</span>)<span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
         <span class="ident">V</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_entry_seed</span>(<span class="ident">kseed</span>, <span class="ident">vseed</span>)
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_entry</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
         <span class="ident">V</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_entry</span>()
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_key</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">K</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_key</span>()
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">next_value</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_value</span>()
     }

     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
         (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">size_hint</span>()
     }
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// Provides a `Visitor` access to the data of an enum in the input.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// `EnumAccess` is created by the `Deserializer` and passed to the</span>
 <span class="doccomment">/// `Visitor` in order to identify which variant of an enum to deserialize.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by the deserialized enum variant. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example implementation</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The [example data format] presented on the website demonstrates an</span>
 <span class="doccomment">/// implementation of `EnumAccess` for a basic JSON data format.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">EnumAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The error type that can be returned if some error occurs during</span>
     <span class="doccomment">/// deserialization.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;
     <span class="doccomment">/// The `Visitor` that will be used to deserialize the content of the enum</span>
     <span class="doccomment">/// variant.</span>
     <span class="kw">type</span> <span class="ident">Variant</span>: <span class="ident">VariantAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// `variant` is called to identify which variant to deserialize.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use `EnumAccess::variant`</span>
     <span class="doccomment">/// instead.</span>
     <span class="kw">fn</span> <span class="ident">variant_seed</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Variant</span>), <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// `variant` is called to identify which variant to deserialize.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `EnumAccess` implementations should not override the default behavior.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">variant</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">V</span>, <span class="ident"><span class="self">Self</span>::Variant</span>), <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">variant_seed</span>(<span class="ident">PhantomData</span>)
     }
 }

 <span class="doccomment">/// `VariantAccess` is a visitor that is created by the `Deserializer` and</span>
 <span class="doccomment">/// passed to the `Deserialize` to deserialize the content of a particular enum</span>
 <span class="doccomment">/// variant.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed by the deserialized enum variant. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example implementation</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The [example data format] presented on the website demonstrates an</span>
 <span class="doccomment">/// implementation of `VariantAccess` for a basic JSON data format.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [example data format]: https://serde.rs/data-format.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">VariantAccess</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The error type that can be returned if some error occurs during</span>
     <span class="doccomment">/// deserialization. Must match the error type of our `EnumAccess`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Called when deserializing a variant with no values.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the data contains a different type of variant, the following</span>
     <span class="doccomment">/// `invalid_type` error should be constructed:</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct X;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;de&gt; VariantAccess&lt;&#39;de&gt; for X {</span>
     <span class="doccomment">/// #     type Error = value::Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn unit_variant(self) -&gt; Result&lt;(), Self::Error&gt; {</span>
     <span class="doccomment">///     // What the data actually contained; suppose it is a tuple variant.</span>
     <span class="doccomment">///     let unexp = Unexpected::TupleVariant;</span>
     <span class="doccomment">///     Err(de::Error::invalid_type(unexp, &amp;&quot;unit variant&quot;))</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn newtype_variant_seed&lt;T&gt;(self, _: T) -&gt; Result&lt;T::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         T: DeserializeSeed&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn tuple_variant&lt;V&gt;(self, _: usize, _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn struct_variant&lt;V&gt;(self, _: &amp;[&amp;str], _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">unit_variant</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Called when deserializing a variant with a single value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// `Deserialize` implementations should typically use</span>
     <span class="doccomment">/// `VariantAccess::newtype_variant` instead.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the data contains a different type of variant, the following</span>
     <span class="doccomment">/// `invalid_type` error should be constructed:</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct X;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;de&gt; VariantAccess&lt;&#39;de&gt; for X {</span>
     <span class="doccomment">/// #     type Error = value::Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn unit_variant(self) -&gt; Result&lt;(), Self::Error&gt; {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn newtype_variant_seed&lt;T&gt;(self, _seed: T) -&gt; Result&lt;T::Value, Self::Error&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     T: DeserializeSeed&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     // What the data actually contained; suppose it is a unit variant.</span>
     <span class="doccomment">///     let unexp = Unexpected::UnitVariant;</span>
     <span class="doccomment">///     Err(de::Error::invalid_type(unexp, &amp;&quot;newtype variant&quot;))</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn tuple_variant&lt;V&gt;(self, _: usize, _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn struct_variant&lt;V&gt;(self, _: &amp;[&amp;str], _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">newtype_variant_seed</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">seed</span>: <span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">DeserializeSeed</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Called when deserializing a variant with a single value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This method exists as a convenience for `Deserialize` implementations.</span>
     <span class="doccomment">/// `VariantAccess` implementations should not override the default</span>
     <span class="doccomment">/// behavior.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">newtype_variant</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Deserialize</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>,
     {
         <span class="self">self</span>.<span class="ident">newtype_variant_seed</span>(<span class="ident">PhantomData</span>)
     }

     <span class="doccomment">/// Called when deserializing a tuple-like variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `len` is the number of fields expected in the tuple variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the data contains a different type of variant, the following</span>
     <span class="doccomment">/// `invalid_type` error should be constructed:</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct X;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;de&gt; VariantAccess&lt;&#39;de&gt; for X {</span>
     <span class="doccomment">/// #     type Error = value::Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn unit_variant(self) -&gt; Result&lt;(), Self::Error&gt; {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn newtype_variant_seed&lt;T&gt;(self, _: T) -&gt; Result&lt;T::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         T: DeserializeSeed&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn tuple_variant&lt;V&gt;(</span>
     <span class="doccomment">///     self,</span>
     <span class="doccomment">///     _len: usize,</span>
     <span class="doccomment">///     _visitor: V,</span>
     <span class="doccomment">/// ) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     // What the data actually contained; suppose it is a unit variant.</span>
     <span class="doccomment">///     let unexp = Unexpected::UnitVariant;</span>
     <span class="doccomment">///     Err(de::Error::invalid_type(unexp, &amp;&quot;tuple variant&quot;))</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn struct_variant&lt;V&gt;(self, _: &amp;[&amp;str], _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">tuple_variant</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">visitor</span>: <span class="ident">V</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Called when deserializing a struct-like variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `fields` are the names of the fields of the struct variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the data contains a different type of variant, the following</span>
     <span class="doccomment">/// `invalid_type` error should be constructed:</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct X;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;de&gt; VariantAccess&lt;&#39;de&gt; for X {</span>
     <span class="doccomment">/// #     type Error = value::Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn unit_variant(self) -&gt; Result&lt;(), Self::Error&gt; {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn newtype_variant_seed&lt;T&gt;(self, _: T) -&gt; Result&lt;T::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         T: DeserializeSeed&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn tuple_variant&lt;V&gt;(self, _: usize, _: V) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// #     where</span>
     <span class="doccomment">/// #         V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// #     { unimplemented!() }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn struct_variant&lt;V&gt;(</span>
     <span class="doccomment">///     self,</span>
     <span class="doccomment">///     _fields: &amp;&#39;static [&amp;&#39;static str],</span>
     <span class="doccomment">///     _visitor: V,</span>
     <span class="doccomment">/// ) -&gt; Result&lt;V::Value, Self::Error&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     V: Visitor&lt;&#39;de&gt;,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     // What the data actually contained; suppose it is a unit variant.</span>
     <span class="doccomment">///     let unexp = Unexpected::UnitVariant;</span>
     <span class="doccomment">///     Err(de::Error::invalid_type(unexp, &amp;&quot;struct variant&quot;))</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">struct_variant</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>(
         <span class="self">self</span>,
         <span class="ident">fields</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>],
         <span class="ident">visitor</span>: <span class="ident">V</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">V::Value</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">V</span>: <span class="ident">Visitor</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span>;
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// Converts an existing value into a `Deserializer` from which other values can</span>
 <span class="doccomment">/// be deserialized.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Lifetime</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The `&#39;de` lifetime of this trait is the lifetime of data that may be</span>
 <span class="doccomment">/// borrowed from the resulting `Deserializer`. See the page [Understanding</span>
 <span class="doccomment">/// deserializer lifetimes] for a more detailed explanation of these lifetimes.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use std::str::FromStr;</span>
 <span class="doccomment">/// use serde::Deserialize;</span>
 <span class="doccomment">/// use serde::de::{value, IntoDeserializer};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// #[derive(Deserialize)]</span>
 <span class="doccomment">/// enum Setting {</span>
 <span class="doccomment">///     On,</span>
 <span class="doccomment">///     Off,</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl FromStr for Setting {</span>
 <span class="doccomment">///     type Err = value::Error;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     fn from_str(s: &amp;str) -&gt; Result&lt;Self, Self::Err&gt; {</span>
 <span class="doccomment">///         Self::deserialize(s.into_deserializer())</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">IntoDeserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">E</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">value::Error</span><span class="op">&gt;</span> {
     <span class="doccomment">/// The type of the deserializer being converted into.</span>
     <span class="kw">type</span> <span class="ident">Deserializer</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">E</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Convert this value into a deserializer.</span>
     <span class="kw">fn</span> <span class="ident">into_deserializer</span>(<span class="self">self</span>) -&gt; <span class="ident"><span class="self">Self</span>::Deserializer</span>;
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// Used in error messages.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// - expected `a`</span>
 <span class="doccomment">/// - expected `a` or `b`</span>
 <span class="doccomment">/// - expected one of `a`, `b`, `c`</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The slice of names must not be empty.</span>
 <span class="kw">struct</span> <span class="ident">OneOf</span> {
     <span class="ident">names</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>],
 }

 <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">OneOf</span> {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="kw">match</span> <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">len</span>() {
             <span class="number">0</span> =&gt; <span class="macro">panic!</span>(), <span class="comment">// special case elsewhere</span>
             <span class="number">1</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;`{}`&quot;</span>, <span class="self">self</span>.<span class="ident">names</span>[<span class="number">0</span>]),
             <span class="number">2</span> =&gt; <span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;`{}` or `{}`&quot;</span>, <span class="self">self</span>.<span class="ident">names</span>[<span class="number">0</span>], <span class="self">self</span>.<span class="ident">names</span>[<span class="number">1</span>]),
             <span class="kw">_</span> =&gt; {
                 <span class="macro">try!</span>(<span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;one of &quot;</span>));
                 <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">alt</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
                     <span class="kw">if</span> <span class="ident">i</span> <span class="op">&gt;</span> <span class="number">0</span> {
                         <span class="macro">try!</span>(<span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;, &quot;</span>));
                     }
                     <span class="macro">try!</span>(<span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">&quot;`{}`&quot;</span>, <span class="ident">alt</span>));
                 }
                 <span class="prelude-val">Ok</span>(())
             }
         }
     }
 }
 </code></pre></div>
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