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 </pre><pre class="rust"><code><span class="doccomment">//! Generic data structure serialization framework.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The two most important traits in this module are [`Serialize`] and</span>
 <span class="doccomment">//! [`Serializer`].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//!  - **A type that implements `Serialize` is a data structure** that can be</span>
 <span class="doccomment">//!    serialized to any data format supported by Serde, and conversely</span>
 <span class="doccomment">//!  - **A type that implements `Serializer` is a data format** that can</span>
 <span class="doccomment">//!    serialize any data structure supported by Serde.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # The Serialize trait</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Serde provides [`Serialize`] 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">//! serialized 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 [`Serialize`] 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 [`Serialize`] manually for</span>
 <span class="doccomment">//! some type in your program. See the [Implementing `Serialize`] section of the</span>
 <span class="doccomment">//! manual for more about this.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Third-party crates may provide [`Serialize`] 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 serializable by Serde because the crate</span>
 <span class="doccomment">//! provides an implementation of [`Serialize`] for it.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # The Serializer trait</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`Serializer`] 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 Serialize provided by Serde</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">//!    - str</span>
 <span class="doccomment">//!    - &amp;T and &amp;mut T</span>
 <span class="doccomment">//!  - **Compound types**:</span>
 <span class="doccomment">//!    - \[T\]</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">//!    - 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">//!  - **FFI types**:</span>
 <span class="doccomment">//!    - CStr</span>
 <span class="doccomment">//!    - CString</span>
 <span class="doccomment">//!    - OsStr</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 `Serialize`]: https://serde.rs/impl-serialize.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">//! [`Serialize`]: ../trait.Serialize.html</span>
 <span class="doccomment">//! [`Serializer`]: ../trait.Serializer.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="kw">mod</span> <span class="ident">fmt</span>;
 <span class="kw">mod</span> <span class="ident">impls</span>;
 <span class="kw">mod</span> <span class="ident">impossible</span>;

 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="self">self</span>::impossible::Impossible</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">/// Trait used by `Serialize` implementations to generically construct</span>
         <span class="doccomment">/// errors belonging to the `Serializer` against which they are</span>
         <span class="doccomment">/// currently running.</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">/// Used when a [`Serialize`] implementation encounters any error</span>
             <span class="doccomment">/// while serializing a type.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// The message should not be capitalized and should not end with a</span>
             <span class="doccomment">/// period.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// For example, a filesystem [`Path`] may refuse to serialize</span>
             <span class="doccomment">/// itself if it contains invalid UTF-8 data.</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// ```edition2018</span>
             <span class="doccomment">/// # struct Path;</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// # impl Path {</span>
             <span class="doccomment">/// #     fn to_str(&amp;self) -&gt; Option&lt;&amp;str&gt; {</span>
             <span class="doccomment">/// #         unimplemented!()</span>
             <span class="doccomment">/// #     }</span>
             <span class="doccomment">/// # }</span>
             <span class="doccomment">/// #</span>
             <span class="doccomment">/// use serde::ser::{self, Serialize, Serializer};</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// impl Serialize for Path {</span>
             <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
             <span class="doccomment">///     where</span>
             <span class="doccomment">///         S: Serializer,</span>
             <span class="doccomment">///     {</span>
             <span class="doccomment">///         match self.to_str() {</span>
             <span class="doccomment">///             Some(s) =&gt; serializer.serialize_str(s),</span>
             <span class="doccomment">///             None =&gt; Err(ser::Error::custom(&quot;path contains invalid UTF-8 characters&quot;)),</span>
             <span class="doccomment">///         }</span>
             <span class="doccomment">///     }</span>
             <span class="doccomment">/// }</span>
             <span class="doccomment">/// ```</span>
             <span class="doccomment">///</span>
             <span class="doccomment">/// [`Path`]: https://doc.rust-lang.org/std/path/struct.Path.html</span>
             <span class="doccomment">/// [`Serialize`]: ../trait.Serialize.html</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="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="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="doccomment">/// A **data structure** that can be serialized into any data format supported</span>
 <span class="doccomment">/// by Serde.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Serde provides `Serialize` implementations for many Rust primitive and</span>
 <span class="doccomment">/// standard library types. The complete list is [here][ser]. All of these can</span>
 <span class="doccomment">/// be serialized 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 `Serialize` implementations for structs and enums in</span>
 <span class="doccomment">/// 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 `Serialize` manually for some</span>
 <span class="doccomment">/// type in your program. See the [Implementing `Serialize`] section of the</span>
 <span class="doccomment">/// manual for more about this.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Third-party crates may provide `Serialize` 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 serializable by Serde because the crate</span>
 <span class="doccomment">/// provides an implementation of `Serialize` for it.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [Implementing `Serialize`]: https://serde.rs/impl-serialize.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">/// [`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">/// [derive section of the manual]: https://serde.rs/derive.html</span>
 <span class="doccomment">/// [ser]: https://docs.serde.rs/serde/ser/index.html</span>
 <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Serialize</span> {
     <span class="doccomment">/// Serialize this value into the given Serde serializer.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// See the [Implementing `Serialize`] section of the manual for more</span>
     <span class="doccomment">/// information about how to implement this method.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeStruct, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct Person {</span>
     <span class="doccomment">///     name: String,</span>
     <span class="doccomment">///     age: u8,</span>
     <span class="doccomment">///     phones: Vec&lt;String&gt;,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// // This is what #[derive(Serialize)] would generate.</span>
     <span class="doccomment">/// impl Serialize for Person {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut s = serializer.serialize_struct(&quot;Person&quot;, 3)?;</span>
     <span class="doccomment">///         s.serialize_field(&quot;name&quot;, &amp;self.name)?;</span>
     <span class="doccomment">///         s.serialize_field(&quot;age&quot;, &amp;self.age)?;</span>
     <span class="doccomment">///         s.serialize_field(&quot;phones&quot;, &amp;self.phones)?;</span>
     <span class="doccomment">///         s.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [Implementing `Serialize`]: https://serde.rs/impl-serialize.html</span>
     <span class="kw">fn</span> <span class="ident">serialize</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">serializer</span>: <span class="ident">S</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">S::Ok</span>, <span class="ident">S::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">S</span>: <span class="ident">Serializer</span>;
 }

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

 <span class="doccomment">/// A **data format** that can serialize any data structure supported by Serde.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// The role of this trait is to define the serialization half of the [Serde</span>
 <span class="doccomment">/// data model], which is a way to categorize every Rust data structure into one</span>
 <span class="doccomment">/// of 29 possible types. Each method of the `Serializer` trait corresponds to</span>
 <span class="doccomment">/// one of the types of the data model.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Implementations of `Serialize` map themselves into this data model by</span>
 <span class="doccomment">/// invoking exactly one of the `Serializer` methods.</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</span>
 <span class="doccomment">///      `Vec&lt;T&gt;` or `HashSet&lt;T&gt;`. When serializing, the length may or may not</span>
 <span class="doccomment">///      be known before iterating through all the data. When deserializing,</span>
 <span class="doccomment">///      the length 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</span>
 <span class="doccomment">///      serialized 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">/// Many Serde serializers produce text or binary data as output, for example</span>
 <span class="doccomment">/// JSON or Bincode. This is not a requirement of the `Serializer` trait, and</span>
 <span class="doccomment">/// there are serializers that do not produce text or binary output. One example</span>
 <span class="doccomment">/// is the `serde_json::value::Serializer` (distinct from the main `serde_json`</span>
 <span class="doccomment">/// serializer) that produces a `serde_json::Value` data structure in memory as</span>
 <span class="doccomment">/// output.</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">/// # 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 `Serializer`.</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">Serializer</span>: <span class="ident">Sized</span> {
     <span class="doccomment">/// The output type produced by this `Serializer` during successful</span>
     <span class="doccomment">/// serialization. Most serializers that produce text or binary output</span>
     <span class="doccomment">/// should set `Ok = ()` and serialize into an [`io::Write`] or buffer</span>
     <span class="doccomment">/// contained within the `Serializer` instance. Serializers that build</span>
     <span class="doccomment">/// in-memory data structures may be simplified by using `Ok` to propagate</span>
     <span class="doccomment">/// the data structure around.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// The error type when some error occurs during serialization.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Type returned from [`serialize_seq`] for serializing the content of the</span>
     <span class="doccomment">/// sequence.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_seq`]: #tymethod.serialize_seq</span>
     <span class="kw">type</span> <span class="ident">SerializeSeq</span>: <span class="ident">SerializeSeq</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_tuple`] for serializing the content of</span>
     <span class="doccomment">/// the tuple.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_tuple`]: #tymethod.serialize_tuple</span>
     <span class="kw">type</span> <span class="ident">SerializeTuple</span>: <span class="ident">SerializeTuple</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_tuple_struct`] for serializing the</span>
     <span class="doccomment">/// content of the tuple struct.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_tuple_struct`]: #tymethod.serialize_tuple_struct</span>
     <span class="kw">type</span> <span class="ident">SerializeTupleStruct</span>: <span class="ident">SerializeTupleStruct</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_tuple_variant`] for serializing the</span>
     <span class="doccomment">/// content of the tuple variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_tuple_variant`]: #tymethod.serialize_tuple_variant</span>
     <span class="kw">type</span> <span class="ident">SerializeTupleVariant</span>: <span class="ident">SerializeTupleVariant</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_map`] for serializing the content of the</span>
     <span class="doccomment">/// map.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_map`]: #tymethod.serialize_map</span>
     <span class="kw">type</span> <span class="ident">SerializeMap</span>: <span class="ident">SerializeMap</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_struct`] for serializing the content of</span>
     <span class="doccomment">/// the struct.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_struct`]: #tymethod.serialize_struct</span>
     <span class="kw">type</span> <span class="ident">SerializeStruct</span>: <span class="ident">SerializeStruct</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Type returned from [`serialize_struct_variant`] for serializing the</span>
     <span class="doccomment">/// content of the struct variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_struct_variant`]: #tymethod.serialize_struct_variant</span>
     <span class="kw">type</span> <span class="ident">SerializeStructVariant</span>: <span class="ident">SerializeStructVariant</span><span class="op">&lt;</span><span class="prelude-val">Ok</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::Ok</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">/// Serialize a `bool` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for bool {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_bool(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_bool</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize an `i8` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `i8` and `i64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `i64` and</span>
     <span class="doccomment">/// forward to `serialize_i64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for i8 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_i8(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_i8</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize an `i16` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `i16` and `i64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `i64` and</span>
     <span class="doccomment">/// forward to `serialize_i64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for i16 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_i16(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_i16</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize an `i32` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `i32` and `i64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `i64` and</span>
     <span class="doccomment">/// forward to `serialize_i64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for i32 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_i32(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_i32</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize an `i64` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for i64 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_i64(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_i64</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// Serialize an `i128` value.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// ```edition2018</span>
         <span class="doccomment">/// # use serde::Serializer;</span>
         <span class="doccomment">/// #</span>
         <span class="doccomment">/// # serde::__private_serialize!();</span>
         <span class="doccomment">/// #</span>
         <span class="doccomment">/// impl Serialize for i128 {</span>
         <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
         <span class="doccomment">///     where</span>
         <span class="doccomment">///         S: Serializer,</span>
         <span class="doccomment">///     {</span>
         <span class="doccomment">///         serializer.serialize_i128(*self)</span>
         <span class="doccomment">///     }</span>
         <span class="doccomment">/// }</span>
         <span class="doccomment">/// ```</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">serialize_i128</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</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::custom</span>(<span class="string">&quot;i128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Serialize a `u8` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `u8` and `u64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `u64` and</span>
     <span class="doccomment">/// forward to `serialize_u64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for u8 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_u8(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_u8</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a `u16` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `u16` and `u64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `u64` and</span>
     <span class="doccomment">/// forward to `serialize_u64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for u16 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_u16(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_u16</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a `u32` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `u32` and `u64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `u64` and</span>
     <span class="doccomment">/// forward to `serialize_u64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for u32 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_u32(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_u32</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a `u64` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for u64 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_u64(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_u64</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="macro">serde_if_integer128!</span> {
         <span class="doccomment">/// Serialize a `u128` value.</span>
         <span class="doccomment">///</span>
         <span class="doccomment">/// ```edition2018</span>
         <span class="doccomment">/// # use serde::Serializer;</span>
         <span class="doccomment">/// #</span>
         <span class="doccomment">/// # serde::__private_serialize!();</span>
         <span class="doccomment">/// #</span>
         <span class="doccomment">/// impl Serialize for u128 {</span>
         <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
         <span class="doccomment">///     where</span>
         <span class="doccomment">///         S: Serializer,</span>
         <span class="doccomment">///     {</span>
         <span class="doccomment">///         serializer.serialize_u128(*self)</span>
         <span class="doccomment">///     }</span>
         <span class="doccomment">/// }</span>
         <span class="doccomment">/// ```</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">serialize_u128</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</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::custom</span>(<span class="string">&quot;u128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Serialize an `f32` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not differentiate between `f32` and `f64`, a</span>
     <span class="doccomment">/// reasonable implementation would be to cast the value to `f64` and</span>
     <span class="doccomment">/// forward to `serialize_f64`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for f32 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_f32(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_f32</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize an `f64` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for f64 {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_f64(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_f64</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a character.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If the format does not support characters, it is reasonable to serialize</span>
     <span class="doccomment">/// it as a single element `str` or a `u32`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for char {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_char(*self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_char</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a `&amp;str`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for str {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_str(self)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_str</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a chunk of raw byte data.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Enables serializers to serialize byte slices more compactly or more</span>
     <span class="doccomment">/// efficiently than other types of slices. If no efficient implementation</span>
     <span class="doccomment">/// is available, a reasonable implementation would be to forward to</span>
     <span class="doccomment">/// `serialize_seq`. If forwarded, the implementation looks usually just</span>
     <span class="doccomment">/// like this:</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::ser::{Serializer, SerializeSeq};</span>
     <span class="doccomment">/// # use serde::__private::doc::Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct MySerializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Serializer for MySerializer {</span>
     <span class="doccomment">/// #     type Ok = ();</span>
     <span class="doccomment">/// #     type Error = Error;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// fn serialize_bytes(self, v: &amp;[u8]) -&gt; Result&lt;Self::Ok, Self::Error&gt; {</span>
     <span class="doccomment">///     let mut seq = self.serialize_seq(Some(v.len()))?;</span>
     <span class="doccomment">///     for b in v {</span>
     <span class="doccomment">///         seq.serialize_element(b)?;</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///     seq.end()</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     serde::__serialize_unimplemented! {</span>
     <span class="doccomment">/// #         bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str none some</span>
     <span class="doccomment">/// #         unit unit_struct unit_variant newtype_struct newtype_variant</span>
     <span class="doccomment">/// #         seq tuple tuple_struct tuple_variant map struct struct_variant</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_bytes</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a [`None`] value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::{Serialize, Serializer};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # enum Option&lt;T&gt; {</span>
     <span class="doccomment">/// #     Some(T),</span>
     <span class="doccomment">/// #     None,</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # use self::Option::{Some, None};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl&lt;T&gt; Serialize for Option&lt;T&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     T: Serialize,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             Some(ref value) =&gt; serializer.serialize_some(value),</span>
     <span class="doccomment">///             None =&gt; serializer.serialize_none(),</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # fn main() {}</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None</span>
     <span class="kw">fn</span> <span class="ident">serialize_none</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a [`Some(T)`] value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::{Serialize, Serializer};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # enum Option&lt;T&gt; {</span>
     <span class="doccomment">/// #     Some(T),</span>
     <span class="doccomment">/// #     None,</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # use self::Option::{Some, None};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl&lt;T&gt; Serialize for Option&lt;T&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     T: Serialize,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             Some(ref value) =&gt; serializer.serialize_some(value),</span>
     <span class="doccomment">///             None =&gt; serializer.serialize_none(),</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # fn main() {}</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`Some(T)`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some</span>
     <span class="kw">fn</span> <span class="ident">serialize_some</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Serialize</span>;

     <span class="doccomment">/// Serialize a `()` value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use serde::Serializer;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # serde::__private_serialize!();</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// impl Serialize for () {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_unit()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_unit</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a unit struct like `struct Unit` or `PhantomData&lt;T&gt;`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// A reasonable implementation would be to forward to `serialize_unit`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct Nothing;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Nothing {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_unit_struct(&quot;Nothing&quot;)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_unit_struct</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>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a unit variant like `E::A` in `enum E { A, B }`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the enum, the `variant_index` is the index of</span>
     <span class="doccomment">/// this variant within the enum, and the `variant` is the name of the</span>
     <span class="doccomment">/// variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// enum E {</span>
     <span class="doccomment">///     A,</span>
     <span class="doccomment">///     B,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for E {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             E::A =&gt; serializer.serialize_unit_variant(&quot;E&quot;, 0, &quot;A&quot;),</span>
     <span class="doccomment">///             E::B =&gt; serializer.serialize_unit_variant(&quot;E&quot;, 1, &quot;B&quot;),</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_unit_variant</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">variant_index</span>: <span class="ident">u32</span>,
         <span class="ident">variant</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Serialize a newtype struct like `struct Millimeters(u8)`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Serializers are encouraged to treat newtype structs as insignificant</span>
     <span class="doccomment">/// wrappers around the data they contain. A reasonable implementation would</span>
     <span class="doccomment">/// be to forward to `value.serialize(self)`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct Millimeters(u8);</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Millimeters {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.serialize_newtype_struct(&quot;Millimeters&quot;, &amp;self.0)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_newtype_struct</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</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">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Serialize</span>;

     <span class="doccomment">/// Serialize a newtype variant like `E::N` in `enum E { N(u8) }`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the enum, the `variant_index` is the index of</span>
     <span class="doccomment">/// this variant within the enum, and the `variant` is the name of the</span>
     <span class="doccomment">/// variant. The `value` is the data contained within this newtype variant.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// enum E {</span>
     <span class="doccomment">///     M(String),</span>
     <span class="doccomment">///     N(u8),</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for E {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             E::M(ref s) =&gt; serializer.serialize_newtype_variant(&quot;E&quot;, 0, &quot;M&quot;, s),</span>
     <span class="doccomment">///             E::N(n) =&gt; serializer.serialize_newtype_variant(&quot;E&quot;, 1, &quot;N&quot;, &amp;n),</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_newtype_variant</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</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">variant_index</span>: <span class="ident">u32</span>,
         <span class="ident">variant</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Serialize</span>;

     <span class="doccomment">/// Begin to serialize a variably sized sequence. This call must be</span>
     <span class="doccomment">/// followed by zero or more calls to `serialize_element`, then a call to</span>
     <span class="doccomment">/// `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The argument is the number of elements in the sequence, which may or may</span>
     <span class="doccomment">/// not be computable before the sequence is iterated. Some serializers only</span>
     <span class="doccomment">/// support sequences whose length is known up front.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use std::marker::PhantomData;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct Vec&lt;T&gt;(PhantomData&lt;T&gt;);</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;T&gt; Vec&lt;T&gt; {</span>
     <span class="doccomment">/// #     fn len(&amp;self) -&gt; usize {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Vec&lt;T&gt; {</span>
     <span class="doccomment">/// #     type Item = &amp;&#39;a T;</span>
     <span class="doccomment">/// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn into_iter(self) -&gt; Self::IntoIter {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeSeq};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl&lt;T&gt; Serialize for Vec&lt;T&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     T: Serialize,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut seq = serializer.serialize_seq(Some(self.len()))?;</span>
     <span class="doccomment">///         for element in self {</span>
     <span class="doccomment">///             seq.serialize_element(element)?;</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///         seq.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_seq</span>(<span class="self">self</span>, <span class="ident">len</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</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>::SerializeSeq</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a statically sized sequence whose length will be</span>
     <span class="doccomment">/// known at deserialization time without looking at the serialized data.</span>
     <span class="doccomment">/// This call must be followed by zero or more calls to `serialize_element`,</span>
     <span class="doccomment">/// then a call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeTuple};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # mod fool {</span>
     <span class="doccomment">/// #     trait Serialize {}</span>
     <span class="doccomment">/// impl&lt;A, B, C&gt; Serialize for (A, B, C)</span>
     <span class="doccomment">/// #     {}</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct Tuple3&lt;A, B, C&gt;(A, B, C);</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;A, B, C&gt; Serialize for Tuple3&lt;A, B, C&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     A: Serialize,</span>
     <span class="doccomment">///     B: Serialize,</span>
     <span class="doccomment">///     C: Serialize,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut tup = serializer.serialize_tuple(3)?;</span>
     <span class="doccomment">///         tup.serialize_element(&amp;self.0)?;</span>
     <span class="doccomment">///         tup.serialize_element(&amp;self.1)?;</span>
     <span class="doccomment">///         tup.serialize_element(&amp;self.2)?;</span>
     <span class="doccomment">///         tup.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeTuple, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// const VRAM_SIZE: usize = 386;</span>
     <span class="doccomment">/// struct Vram([u16; VRAM_SIZE]);</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Vram {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut seq = serializer.serialize_tuple(VRAM_SIZE)?;</span>
     <span class="doccomment">///         for element in &amp;self.0[..] {</span>
     <span class="doccomment">///             seq.serialize_element(element)?;</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///         seq.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_tuple</span>(<span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::SerializeTuple</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a tuple struct like `struct Rgb(u8, u8, u8)`. This</span>
     <span class="doccomment">/// call must be followed by zero or more calls to `serialize_field`, then a</span>
     <span class="doccomment">/// call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the tuple struct and the `len` is the number</span>
     <span class="doccomment">/// of data fields that will be serialized.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct Rgb(u8, u8, u8);</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Rgb {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut ts = serializer.serialize_tuple_struct(&quot;Rgb&quot;, 3)?;</span>
     <span class="doccomment">///         ts.serialize_field(&amp;self.0)?;</span>
     <span class="doccomment">///         ts.serialize_field(&amp;self.1)?;</span>
     <span class="doccomment">///         ts.serialize_field(&amp;self.2)?;</span>
     <span class="doccomment">///         ts.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_tuple_struct</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>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::SerializeTupleStruct</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a tuple variant like `E::T` in `enum E { T(u8, u8)</span>
     <span class="doccomment">/// }`. This call must be followed by zero or more calls to</span>
     <span class="doccomment">/// `serialize_field`, then a call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the enum, the `variant_index` is the index of</span>
     <span class="doccomment">/// this variant within the enum, the `variant` is the name of the variant,</span>
     <span class="doccomment">/// and the `len` is the number of data fields that will be serialized.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// enum E {</span>
     <span class="doccomment">///     T(u8, u8),</span>
     <span class="doccomment">///     U(String, u32, u32),</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for E {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             E::T(ref a, ref b) =&gt; {</span>
     <span class="doccomment">///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 0, &quot;T&quot;, 2)?;</span>
     <span class="doccomment">///                 tv.serialize_field(a)?;</span>
     <span class="doccomment">///                 tv.serialize_field(b)?;</span>
     <span class="doccomment">///                 tv.end()</span>
     <span class="doccomment">///             }</span>
     <span class="doccomment">///             E::U(ref a, ref b, ref c) =&gt; {</span>
     <span class="doccomment">///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 1, &quot;U&quot;, 3)?;</span>
     <span class="doccomment">///                 tv.serialize_field(a)?;</span>
     <span class="doccomment">///                 tv.serialize_field(b)?;</span>
     <span class="doccomment">///                 tv.serialize_field(c)?;</span>
     <span class="doccomment">///                 tv.end()</span>
     <span class="doccomment">///             }</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_tuple_variant</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">variant_index</span>: <span class="ident">u32</span>,
         <span class="ident">variant</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>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::SerializeTupleVariant</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a map. This call must be followed by zero or more</span>
     <span class="doccomment">/// calls to `serialize_key` and `serialize_value`, then a call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The argument is the number of elements in the map, which may or may not</span>
     <span class="doccomment">/// be computable before the map is iterated. Some serializers only support</span>
     <span class="doccomment">/// maps whose length is known up front.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # use std::marker::PhantomData;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct HashMap&lt;K, V&gt;(PhantomData&lt;K&gt;, PhantomData&lt;V&gt;);</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;K, V&gt; HashMap&lt;K, V&gt; {</span>
     <span class="doccomment">/// #     fn len(&amp;self) -&gt; usize {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl&lt;&#39;a, K, V&gt; IntoIterator for &amp;&#39;a HashMap&lt;K, V&gt; {</span>
     <span class="doccomment">/// #     type Item = (&amp;&#39;a K, &amp;&#39;a V);</span>
     <span class="doccomment">/// #     type IntoIter = Box&lt;Iterator&lt;Item = (&amp;&#39;a K, &amp;&#39;a V)&gt;&gt;;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// #     fn into_iter(self) -&gt; Self::IntoIter {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeMap};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl&lt;K, V&gt; Serialize for HashMap&lt;K, V&gt;</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     K: Serialize,</span>
     <span class="doccomment">///     V: Serialize,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut map = serializer.serialize_map(Some(self.len()))?;</span>
     <span class="doccomment">///         for (k, v) in self {</span>
     <span class="doccomment">///             map.serialize_entry(k, v)?;</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///         map.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_map</span>(<span class="self">self</span>, <span class="ident">len</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</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>::SerializeMap</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a struct like `struct Rgb { r: u8, g: u8, b: u8 }`.</span>
     <span class="doccomment">/// This call must be followed by zero or more calls to `serialize_field`,</span>
     <span class="doccomment">/// then a call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the struct and the `len` is the number of</span>
     <span class="doccomment">/// data fields that will be serialized.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeStruct, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct Rgb {</span>
     <span class="doccomment">///     r: u8,</span>
     <span class="doccomment">///     g: u8,</span>
     <span class="doccomment">///     b: u8,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Rgb {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         let mut rgb = serializer.serialize_struct(&quot;Rgb&quot;, 3)?;</span>
     <span class="doccomment">///         rgb.serialize_field(&quot;r&quot;, &amp;self.r)?;</span>
     <span class="doccomment">///         rgb.serialize_field(&quot;g&quot;, &amp;self.g)?;</span>
     <span class="doccomment">///         rgb.serialize_field(&quot;b&quot;, &amp;self.b)?;</span>
     <span class="doccomment">///         rgb.end()</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_struct</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>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::SerializeStruct</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Begin to serialize a struct variant like `E::S` in `enum E { S { r: u8,</span>
     <span class="doccomment">/// g: u8, b: u8 } }`. This call must be followed by zero or more calls to</span>
     <span class="doccomment">/// `serialize_field`, then a call to `end`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `name` is the name of the enum, the `variant_index` is the index of</span>
     <span class="doccomment">/// this variant within the enum, the `variant` is the name of the variant,</span>
     <span class="doccomment">/// and the `len` is the number of data fields that will be serialized.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::ser::{Serialize, SerializeStructVariant, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// enum E {</span>
     <span class="doccomment">///     S { r: u8, g: u8, b: u8 },</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for E {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         match *self {</span>
     <span class="doccomment">///             E::S {</span>
     <span class="doccomment">///                 ref r,</span>
     <span class="doccomment">///                 ref g,</span>
     <span class="doccomment">///                 ref b,</span>
     <span class="doccomment">///             } =&gt; {</span>
     <span class="doccomment">///                 let mut sv = serializer.serialize_struct_variant(&quot;E&quot;, 0, &quot;S&quot;, 3)?;</span>
     <span class="doccomment">///                 sv.serialize_field(&quot;r&quot;, r)?;</span>
     <span class="doccomment">///                 sv.serialize_field(&quot;g&quot;, g)?;</span>
     <span class="doccomment">///                 sv.serialize_field(&quot;b&quot;, b)?;</span>
     <span class="doccomment">///                 sv.end()</span>
     <span class="doccomment">///             }</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="kw">fn</span> <span class="ident">serialize_struct_variant</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">variant_index</span>: <span class="ident">u32</span>,
         <span class="ident">variant</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>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::SerializeStructVariant</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;

     <span class="doccomment">/// Collect an iterator as a sequence.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation serializes each item yielded by the iterator</span>
     <span class="doccomment">/// using [`serialize_seq`]. Implementors should not need to override this</span>
     <span class="doccomment">/// method.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct SecretlyOneHigher {</span>
     <span class="doccomment">///     data: Vec&lt;i32&gt;,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for SecretlyOneHigher {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.collect_seq(self.data.iter().map(|x| x + 1))</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_seq`]: #tymethod.serialize_seq</span>
     <span class="kw">fn</span> <span class="ident">collect_seq</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">I</span>: <span class="ident">IntoIterator</span>,
         <span class="op">&lt;</span><span class="ident">I</span> <span class="kw">as</span> <span class="ident">IntoIterator</span><span class="op">&gt;</span><span class="ident">::Item</span>: <span class="ident">Serialize</span>,
     {
         <span class="kw">let</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">into_iter</span>();
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">serializer</span> <span class="op">=</span> <span class="macro">try!</span>(<span class="self">self</span>.<span class="ident">serialize_seq</span>(<span class="ident">iterator_len_hint</span>(<span class="kw-2">&amp;</span><span class="ident">iter</span>)));

         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">iterator_try_fold</span>)]</span>
         {
             <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>;
             <span class="macro">try!</span>(<span class="ident">iter</span>.<span class="ident">try_for_each</span>(<span class="op">|</span><span class="ident">item</span><span class="op">|</span> <span class="ident">serializer</span>.<span class="ident">serialize_element</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>)));
         }

         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">iterator_try_fold</span>))]</span>
         {
             <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">iter</span> {
                 <span class="macro">try!</span>(<span class="ident">serializer</span>.<span class="ident">serialize_element</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>));
             }
         }

         <span class="ident">serializer</span>.<span class="ident">end</span>()
     }

     <span class="doccomment">/// Collect an iterator as a map.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation serializes each pair yielded by the iterator</span>
     <span class="doccomment">/// using [`serialize_map`]. Implementors should not need to override this</span>
     <span class="doccomment">/// method.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">/// use std::collections::BTreeSet;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct MapToUnit {</span>
     <span class="doccomment">///     keys: BTreeSet&lt;i32&gt;,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// // Serializes as a map in which the values are all unit.</span>
     <span class="doccomment">/// impl Serialize for MapToUnit {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.collect_map(self.keys.iter().map(|k| (k, ())))</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`serialize_map`]: #tymethod.serialize_map</span>
     <span class="kw">fn</span> <span class="ident">collect_map</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">I</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Serialize</span>,
         <span class="ident">V</span>: <span class="ident">Serialize</span>,
         <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">&gt;</span>,
     {
         <span class="kw">let</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">into_iter</span>();
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">serializer</span> <span class="op">=</span> <span class="macro">try!</span>(<span class="self">self</span>.<span class="ident">serialize_map</span>(<span class="ident">iterator_len_hint</span>(<span class="kw-2">&amp;</span><span class="ident">iter</span>)));

         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">iterator_try_fold</span>)]</span>
         {
             <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">iter</span>;
             <span class="macro">try!</span>(<span class="ident">iter</span>.<span class="ident">try_for_each</span>(<span class="op">|</span>(<span class="ident">key</span>, <span class="ident">value</span>)<span class="op">|</span> <span class="ident">serializer</span>.<span class="ident">serialize_entry</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>, <span class="kw-2">&amp;</span><span class="ident">value</span>)));
         }

         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">iterator_try_fold</span>))]</span>
         {
             <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="ident">iter</span> {
                 <span class="macro">try!</span>(<span class="ident">serializer</span>.<span class="ident">serialize_entry</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>, <span class="kw-2">&amp;</span><span class="ident">value</span>));
             }
         }

         <span class="ident">serializer</span>.<span class="ident">end</span>()
     }

     <span class="doccomment">/// Serialize a string produced by an implementation of `Display`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation builds a heap-allocated [`String`] and</span>
     <span class="doccomment">/// delegates to [`serialize_str`]. Serializers are encouraged to provide a</span>
     <span class="doccomment">/// more efficient implementation if possible.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # struct DateTime;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl DateTime {</span>
     <span class="doccomment">/// #     fn naive_local(&amp;self) -&gt; () { () }</span>
     <span class="doccomment">/// #     fn offset(&amp;self) -&gt; () { () }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for DateTime {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.collect_str(&amp;format_args!(&quot;{:?}{:?}&quot;,</span>
     <span class="doccomment">///                                              self.naive_local(),</span>
     <span class="doccomment">///                                              self.offset()))</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`String`]: https://doc.rust-lang.org/std/string/struct.String.html</span>
     <span class="doccomment">/// [`serialize_str`]: #tymethod.serialize_str</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">collect_str</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Display</span>,
     {
         <span class="self">self</span>.<span class="ident">serialize_str</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>.<span class="ident">to_string</span>())
     }

     <span class="doccomment">/// Serialize a string produced by an implementation of `Display`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Serializers that use `no_std` are required to provide an implementation</span>
     <span class="doccomment">/// of this method. If no more sensible behavior is possible, the</span>
     <span class="doccomment">/// implementation is expected to return an error.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```edition2018</span>
     <span class="doccomment">/// # struct DateTime;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl DateTime {</span>
     <span class="doccomment">/// #     fn naive_local(&amp;self) -&gt; () { () }</span>
     <span class="doccomment">/// #     fn offset(&amp;self) -&gt; () { () }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for DateTime {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         serializer.collect_str(&amp;format_args!(&quot;{:?}{:?}&quot;,</span>
     <span class="doccomment">///                                              self.naive_local(),</span>
     <span class="doccomment">///                                              self.offset()))</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</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">collect_str</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Ok</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">Display</span>;

     <span class="doccomment">/// Determine whether `Serialize` implementations should serialize in</span>
     <span class="doccomment">/// 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::fmt::{self, Display};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # struct Timestamp;</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Timestamp {</span>
     <span class="doccomment">/// #     fn seconds_since_epoch(&amp;self) -&gt; u64 { unimplemented!() }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// # impl Display for Timestamp {</span>
     <span class="doccomment">/// #     fn fmt(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {</span>
     <span class="doccomment">/// #         unimplemented!()</span>
     <span class="doccomment">/// #     }</span>
     <span class="doccomment">/// # }</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// use serde::{Serialize, Serializer};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Serialize for Timestamp {</span>
     <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
     <span class="doccomment">///     where</span>
     <span class="doccomment">///         S: Serializer,</span>
     <span class="doccomment">///     {</span>
     <span class="doccomment">///         if serializer.is_human_readable() {</span>
     <span class="doccomment">///             // Serialize to a human-readable string &quot;2015-05-15T17:01:00Z&quot;.</span>
     <span class="doccomment">///             self.to_string().serialize(serializer)</span>
     <span class="doccomment">///         } else {</span>
     <span class="doccomment">///             // Serialize to a compact binary representation.</span>
     <span class="doccomment">///             self.seconds_since_epoch().serialize(serializer)</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="doccomment">/// Returned from `Serializer::serialize_seq`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::marker::PhantomData;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct Vec&lt;T&gt;(PhantomData&lt;T&gt;);</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;T&gt; Vec&lt;T&gt; {</span>
 <span class="doccomment">/// #     fn len(&amp;self) -&gt; usize {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Vec&lt;T&gt; {</span>
 <span class="doccomment">/// #     type Item = &amp;&#39;a T;</span>
 <span class="doccomment">/// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;</span>
 <span class="doccomment">/// #     fn into_iter(self) -&gt; Self::IntoIter {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeSeq};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl&lt;T&gt; Serialize for Vec&lt;T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     T: Serialize,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut seq = serializer.serialize_seq(Some(self.len()))?;</span>
 <span class="doccomment">///         for element in self {</span>
 <span class="doccomment">///             seq.serialize_element(element)?;</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///         seq.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeSeq` 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">SerializeSeq</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a sequence element.</span>
     <span class="kw">fn</span> <span class="ident">serialize_element</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Finish serializing a sequence.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeTuple};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # mod fool {</span>
 <span class="doccomment">/// #     trait Serialize {}</span>
 <span class="doccomment">/// impl&lt;A, B, C&gt; Serialize for (A, B, C)</span>
 <span class="doccomment">/// #     {}</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct Tuple3&lt;A, B, C&gt;(A, B, C);</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;A, B, C&gt; Serialize for Tuple3&lt;A, B, C&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     A: Serialize,</span>
 <span class="doccomment">///     B: Serialize,</span>
 <span class="doccomment">///     C: Serialize,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut tup = serializer.serialize_tuple(3)?;</span>
 <span class="doccomment">///         tup.serialize_element(&amp;self.0)?;</span>
 <span class="doccomment">///         tup.serialize_element(&amp;self.1)?;</span>
 <span class="doccomment">///         tup.serialize_element(&amp;self.2)?;</span>
 <span class="doccomment">///         tup.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::marker::PhantomData;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct Array&lt;T&gt;(PhantomData&lt;T&gt;);</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;T&gt; Array&lt;T&gt; {</span>
 <span class="doccomment">/// #     fn len(&amp;self) -&gt; usize {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Array&lt;T&gt; {</span>
 <span class="doccomment">/// #     type Item = &amp;&#39;a T;</span>
 <span class="doccomment">/// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;</span>
 <span class="doccomment">/// #     fn into_iter(self) -&gt; Self::IntoIter {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeTuple};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # mod fool {</span>
 <span class="doccomment">/// #     trait Serialize {}</span>
 <span class="doccomment">/// impl&lt;T&gt; Serialize for [T; 16]</span>
 <span class="doccomment">/// #     {}</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;T&gt; Serialize for Array&lt;T&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     T: Serialize,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut seq = serializer.serialize_tuple(16)?;</span>
 <span class="doccomment">///         for element in self {</span>
 <span class="doccomment">///             seq.serialize_element(element)?;</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///         seq.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeTuple` 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">SerializeTuple</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a tuple element.</span>
     <span class="kw">fn</span> <span class="ident">serialize_element</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Finish serializing a tuple.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple_struct`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// struct Rgb(u8, u8, u8);</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl Serialize for Rgb {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut ts = serializer.serialize_tuple_struct(&quot;Rgb&quot;, 3)?;</span>
 <span class="doccomment">///         ts.serialize_field(&amp;self.0)?;</span>
 <span class="doccomment">///         ts.serialize_field(&amp;self.1)?;</span>
 <span class="doccomment">///         ts.serialize_field(&amp;self.2)?;</span>
 <span class="doccomment">///         ts.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeTupleStruct` 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">SerializeTupleStruct</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a tuple struct field.</span>
     <span class="kw">fn</span> <span class="ident">serialize_field</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Finish serializing a tuple struct.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple_variant`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// enum E {</span>
 <span class="doccomment">///     T(u8, u8),</span>
 <span class="doccomment">///     U(String, u32, u32),</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl Serialize for E {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         match *self {</span>
 <span class="doccomment">///             E::T(ref a, ref b) =&gt; {</span>
 <span class="doccomment">///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 0, &quot;T&quot;, 2)?;</span>
 <span class="doccomment">///                 tv.serialize_field(a)?;</span>
 <span class="doccomment">///                 tv.serialize_field(b)?;</span>
 <span class="doccomment">///                 tv.end()</span>
 <span class="doccomment">///             }</span>
 <span class="doccomment">///             E::U(ref a, ref b, ref c) =&gt; {</span>
 <span class="doccomment">///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 1, &quot;U&quot;, 3)?;</span>
 <span class="doccomment">///                 tv.serialize_field(a)?;</span>
 <span class="doccomment">///                 tv.serialize_field(b)?;</span>
 <span class="doccomment">///                 tv.serialize_field(c)?;</span>
 <span class="doccomment">///                 tv.end()</span>
 <span class="doccomment">///             }</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeTupleVariant` 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">SerializeTupleVariant</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a tuple variant field.</span>
     <span class="kw">fn</span> <span class="ident">serialize_field</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Finish serializing a tuple variant.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_map`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// # use std::marker::PhantomData;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # struct HashMap&lt;K, V&gt;(PhantomData&lt;K&gt;, PhantomData&lt;V&gt;);</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;K, V&gt; HashMap&lt;K, V&gt; {</span>
 <span class="doccomment">/// #     fn len(&amp;self) -&gt; usize {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # impl&lt;&#39;a, K, V&gt; IntoIterator for &amp;&#39;a HashMap&lt;K, V&gt; {</span>
 <span class="doccomment">/// #     type Item = (&amp;&#39;a K, &amp;&#39;a V);</span>
 <span class="doccomment">/// #     type IntoIter = Box&lt;Iterator&lt;Item = (&amp;&#39;a K, &amp;&#39;a V)&gt;&gt;;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// #     fn into_iter(self) -&gt; Self::IntoIter {</span>
 <span class="doccomment">/// #         unimplemented!()</span>
 <span class="doccomment">/// #     }</span>
 <span class="doccomment">/// # }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// use serde::ser::{Serialize, Serializer, SerializeMap};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl&lt;K, V&gt; Serialize for HashMap&lt;K, V&gt;</span>
 <span class="doccomment">/// where</span>
 <span class="doccomment">///     K: Serialize,</span>
 <span class="doccomment">///     V: Serialize,</span>
 <span class="doccomment">/// {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut map = serializer.serialize_map(Some(self.len()))?;</span>
 <span class="doccomment">///         for (k, v) in self {</span>
 <span class="doccomment">///             map.serialize_entry(k, v)?;</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///         map.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeMap` 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">SerializeMap</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a map key.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If possible, `Serialize` implementations are encouraged to use</span>
     <span class="doccomment">/// `serialize_entry` instead as it may be implemented more efficiently in</span>
     <span class="doccomment">/// some formats compared to a pair of calls to `serialize_key` and</span>
     <span class="doccomment">/// `serialize_value`.</span>
     <span class="kw">fn</span> <span class="ident">serialize_key</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Serialize a map value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Calling `serialize_value` before `serialize_key` is incorrect and is</span>
     <span class="doccomment">/// allowed to panic or produce bogus results.</span>
     <span class="kw">fn</span> <span class="ident">serialize_value</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Serialize a map entry consisting of a key and a value.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Some [`Serialize`] types are not able to hold a key and value in memory</span>
     <span class="doccomment">/// at the same time so `SerializeMap` implementations are required to</span>
     <span class="doccomment">/// support [`serialize_key`] and [`serialize_value`] individually. The</span>
     <span class="doccomment">/// `serialize_entry` method allows serializers to optimize for the case</span>
     <span class="doccomment">/// where key and value are both available. [`Serialize`] implementations</span>
     <span class="doccomment">/// are encouraged to use `serialize_entry` if possible.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The default implementation delegates to [`serialize_key`] and</span>
     <span class="doccomment">/// [`serialize_value`]. This is appropriate for serializers that do not</span>
     <span class="doccomment">/// care about performance or are not able to optimize `serialize_entry` any</span>
     <span class="doccomment">/// better than this.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`Serialize`]: ../trait.Serialize.html</span>
     <span class="doccomment">/// [`serialize_key`]: #tymethod.serialize_key</span>
     <span class="doccomment">/// [`serialize_value`]: #tymethod.serialize_value</span>
     <span class="kw">fn</span> <span class="ident">serialize_entry</span><span class="op">&lt;</span><span class="ident">K</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">V</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
         <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
         <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">K</span>,
         <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">V</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="kw">where</span>
         <span class="ident">K</span>: <span class="ident">Serialize</span>,
         <span class="ident">V</span>: <span class="ident">Serialize</span>,
     {
         <span class="macro">try!</span>(<span class="self">self</span>.<span class="ident">serialize_key</span>(<span class="ident">key</span>));
         <span class="self">self</span>.<span class="ident">serialize_value</span>(<span class="ident">value</span>)
     }

     <span class="doccomment">/// Finish serializing a map.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_struct`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use serde::ser::{Serialize, SerializeStruct, Serializer};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// struct Rgb {</span>
 <span class="doccomment">///     r: u8,</span>
 <span class="doccomment">///     g: u8,</span>
 <span class="doccomment">///     b: u8,</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl Serialize for Rgb {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         let mut rgb = serializer.serialize_struct(&quot;Rgb&quot;, 3)?;</span>
 <span class="doccomment">///         rgb.serialize_field(&quot;r&quot;, &amp;self.r)?;</span>
 <span class="doccomment">///         rgb.serialize_field(&quot;g&quot;, &amp;self.g)?;</span>
 <span class="doccomment">///         rgb.serialize_field(&quot;b&quot;, &amp;self.b)?;</span>
 <span class="doccomment">///         rgb.end()</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeStruct` 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">SerializeStruct</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a struct field.</span>
     <span class="kw">fn</span> <span class="ident">serialize_field</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
         <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
         <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Indicate that a struct field has been skipped.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">skip_field</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</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>::Error</span><span class="op">&gt;</span> {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">key</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Finish serializing a struct.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_struct_variant`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Example use</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```edition2018</span>
 <span class="doccomment">/// use serde::ser::{Serialize, SerializeStructVariant, Serializer};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// enum E {</span>
 <span class="doccomment">///     S { r: u8, g: u8, b: u8 },</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// impl Serialize for E {</span>
 <span class="doccomment">///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;</span>
 <span class="doccomment">///     where</span>
 <span class="doccomment">///         S: Serializer,</span>
 <span class="doccomment">///     {</span>
 <span class="doccomment">///         match *self {</span>
 <span class="doccomment">///             E::S {</span>
 <span class="doccomment">///                 ref r,</span>
 <span class="doccomment">///                 ref g,</span>
 <span class="doccomment">///                 ref b,</span>
 <span class="doccomment">///             } =&gt; {</span>
 <span class="doccomment">///                 let mut sv = serializer.serialize_struct_variant(&quot;E&quot;, 0, &quot;S&quot;, 3)?;</span>
 <span class="doccomment">///                 sv.serialize_field(&quot;r&quot;, r)?;</span>
 <span class="doccomment">///                 sv.serialize_field(&quot;g&quot;, g)?;</span>
 <span class="doccomment">///                 sv.serialize_field(&quot;b&quot;, b)?;</span>
 <span class="doccomment">///                 sv.end()</span>
 <span class="doccomment">///             }</span>
 <span class="doccomment">///         }</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</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 `SerializeStructVariant` 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">SerializeStructVariant</span> {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.</span>
     <span class="kw">type</span> <span class="ident">Error</span>: <span class="ident">Error</span>;

     <span class="doccomment">/// Serialize a struct variant field.</span>
     <span class="kw">fn</span> <span class="ident">serialize_field</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
         <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
         <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
         <span class="ident">value</span>: <span class="kw-2">&amp;</span><span class="ident">T</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="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Serialize</span>;

     <span class="doccomment">/// Indicate that a struct variant field has been skipped.</span>
     <span class="attribute">#[<span class="ident">inline</span>]</span>
     <span class="kw">fn</span> <span class="ident">skip_field</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</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>::Error</span><span class="op">&gt;</span> {
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">key</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Finish serializing a struct variant.</span>
     <span class="kw">fn</span> <span class="ident">end</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>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">&gt;</span>;
 }

 <span class="kw">fn</span> <span class="ident">iterator_len_hint</span><span class="op">&lt;</span><span class="ident">I</span><span class="op">&gt;</span>(<span class="ident">iter</span>: <span class="kw-2">&amp;</span><span class="ident">I</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">where</span>
     <span class="ident">I</span>: <span class="ident">Iterator</span>,
 {
     <span class="kw">match</span> <span class="ident">iter</span>.<span class="ident">size_hint</span>() {
         (<span class="ident">lo</span>, <span class="prelude-val">Some</span>(<span class="ident">hi</span>)) <span class="kw">if</span> <span class="ident">lo</span> <span class="op">==</span> <span class="ident">hi</span> =&gt; <span class="prelude-val">Some</span>(<span class="ident">lo</span>),
         <span class="kw">_</span> =&gt; <span class="prelude-val">None</span>,
     }
 }
 </code></pre></div>
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