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 </pre><pre class="rust"><code><span class="doccomment">//! A punctuated sequence of syntax tree nodes separated by punctuation.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Lots of things in Rust are punctuated sequences.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - The fields of a struct are `Punctuated&lt;Field, Token![,]&gt;`.</span>
 <span class="doccomment">//! - The segments of a path are `Punctuated&lt;PathSegment, Token![::]&gt;`.</span>
 <span class="doccomment">//! - The bounds on a generic parameter are `Punctuated&lt;TypeParamBound,</span>
 <span class="doccomment">//!   Token![+]&gt;`.</span>
 <span class="doccomment">//! - The arguments to a function call are `Punctuated&lt;Expr, Token![,]&gt;`.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! This module provides a common representation for these punctuated sequences</span>
 <span class="doccomment">//! in the form of the [`Punctuated&lt;T, P&gt;`] type. We store a vector of pairs of</span>
 <span class="doccomment">//! syntax tree node + punctuation, where every node in the sequence is followed</span>
 <span class="doccomment">//! by punctuation except for possibly the final one.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`Punctuated&lt;T, P&gt;`]: Punctuated</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```text</span>
 <span class="doccomment">//! a_function_call(arg1, arg2, arg3);</span>
 <span class="doccomment">//!                 ~~~~^ ~~~~^ ~~~~</span>
 <span class="doccomment">//! ```</span>

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="kw">use</span> <span class="ident">std::fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>};
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="kw">use</span> <span class="ident">std::hash</span>::{<span class="ident">Hash</span>, <span class="ident">Hasher</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;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">use</span> <span class="ident">std::iter</span>;
 <span class="kw">use</span> <span class="ident">std::iter::FromIterator</span>;
 <span class="kw">use</span> <span class="ident">std::ops</span>::{<span class="ident">Index</span>, <span class="ident">IndexMut</span>};
 <span class="kw">use</span> <span class="ident">std::option</span>;
 <span class="kw">use</span> <span class="ident">std::slice</span>;
 <span class="kw">use</span> <span class="ident">std::vec</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>};
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::token::Token</span>;

 <span class="doccomment">/// A punctuated sequence of syntax tree nodes of type `T` separated by</span>
 <span class="doccomment">/// punctuation of type `P`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>,
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="doccomment">/// Creates an empty punctuated sequence.</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">syn_no_const_vec_new</span>))]</span>
     <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>() -&gt; <span class="self">Self</span> {
         <span class="ident">Punctuated</span> {
             <span class="ident">inner</span>: <span class="ident">Vec::new</span>(),
             <span class="ident">last</span>: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Creates an empty punctuated sequence.</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">syn_no_const_vec_new</span>)]</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -&gt; <span class="self">Self</span> {
         <span class="ident">Punctuated</span> {
             <span class="ident">inner</span>: <span class="ident">Vec::new</span>(),
             <span class="ident">last</span>: <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Determines whether this punctuated sequence is empty, meaning it</span>
     <span class="doccomment">/// contains no syntax tree nodes or punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_none</span>()
     }

     <span class="doccomment">/// Returns the number of syntax tree nodes in this punctuated sequence.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This is the number of nodes of type `T`, not counting the punctuation of</span>
     <span class="doccomment">/// type `P`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_some</span>() { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> }
     }

     <span class="doccomment">/// Borrows the first element in this sequence.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">first</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">next</span>()
     }

     <span class="doccomment">/// Mutably borrows the first element in this sequence.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">first_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;mut</span> <span class="ident">T</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">iter_mut</span>().<span class="ident">next</span>()
     }

     <span class="doccomment">/// Borrows the last element in this sequence.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">next_back</span>()
     }

     <span class="doccomment">/// Mutably borrows the last element in this sequence.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">last_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;mut</span> <span class="ident">T</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">iter_mut</span>().<span class="ident">next_back</span>()
     }

     <span class="doccomment">/// Returns an iterator over borrowed syntax tree nodes of type `&amp;T`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
         <span class="ident">Iter</span> {
             <span class="ident">inner</span>: <span class="ident">Box::new</span>(<span class="ident">PrivateIter</span> {
                 <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">iter</span>(),
                 <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="ident">Box::as_ref</span>).<span class="ident">into_iter</span>(),
             }),
         }
     }

     <span class="doccomment">/// Returns an iterator over mutably borrowed syntax tree nodes of type</span>
     <span class="doccomment">/// `&amp;mut T`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="ident">IterMut</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
         <span class="ident">IterMut</span> {
             <span class="ident">inner</span>: <span class="ident">Box::new</span>(<span class="ident">PrivateIterMut</span> {
                 <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">iter_mut</span>(),
                 <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">as_mut</span>().<span class="ident">map</span>(<span class="ident">Box::as_mut</span>).<span class="ident">into_iter</span>(),
             }),
         }
     }

     <span class="doccomment">/// Returns an iterator over the contents of this sequence as borrowed</span>
     <span class="doccomment">/// punctuated pairs.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pairs</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Pairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
         <span class="ident">Pairs</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">iter</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="ident">Box::as_ref</span>).<span class="ident">into_iter</span>(),
         }
     }

     <span class="doccomment">/// Returns an iterator over the contents of this sequence as mutably</span>
     <span class="doccomment">/// borrowed punctuated pairs.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pairs_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="ident">PairsMut</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
         <span class="ident">PairsMut</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">iter_mut</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">as_mut</span>().<span class="ident">map</span>(<span class="ident">Box::as_mut</span>).<span class="ident">into_iter</span>(),
         }
     }

     <span class="doccomment">/// Returns an iterator over the contents of this sequence as owned</span>
     <span class="doccomment">/// punctuated pairs.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_pairs</span>(<span class="self">self</span>) -&gt; <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
         <span class="ident">IntoPairs</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">into_iter</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">t</span>).<span class="ident">into_iter</span>(),
         }
     }

     <span class="doccomment">/// Appends a syntax tree node onto the end of this punctuated sequence. The</span>
     <span class="doccomment">/// sequence must previously have a trailing punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Use [`push`] instead if the punctuated sequence may or may not already</span>
     <span class="doccomment">/// have trailing punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`push`]: Punctuated::push</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Panics if the sequence does not already have a trailing punctuation when</span>
     <span class="doccomment">/// this method is called.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push_value</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) {
         <span class="macro">assert!</span>(
             <span class="self">self</span>.<span class="ident">empty_or_trailing</span>(),
             <span class="string">&quot;Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation&quot;</span>,
         );

         <span class="self">self</span>.<span class="ident">last</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box::new</span>(<span class="ident">value</span>));
     }

     <span class="doccomment">/// Appends a trailing punctuation onto the end of this punctuated sequence.</span>
     <span class="doccomment">/// The sequence must be non-empty and must not already have trailing</span>
     <span class="doccomment">/// punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Panics if the sequence is empty or already has a trailing punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push_punct</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">punctuation</span>: <span class="ident">P</span>) {
         <span class="macro">assert!</span>(
             <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_some</span>(),
             <span class="string">&quot;Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation&quot;</span>,
         );

         <span class="kw">let</span> <span class="ident">last</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">push</span>((<span class="kw-2">*</span><span class="ident">last</span>, <span class="ident">punctuation</span>));
     }

     <span class="doccomment">/// Removes the last punctuated pair from this sequence, or `None` if the</span>
     <span class="doccomment">/// sequence is empty.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pop</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span><span class="op">&gt;</span> {
         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_some</span>() {
             <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">take</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="ident">Pair::End</span>(<span class="kw-2">*</span><span class="ident">t</span>))
         } <span class="kw">else</span> {
             <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">pop</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>))
         }
     }

     <span class="doccomment">/// Determines whether this punctuated sequence ends with a trailing</span>
     <span class="doccomment">/// punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trailing_punct</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
         <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_none</span>() <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>()
     }

     <span class="doccomment">/// Returns true if either this `Punctuated` is empty, or it has a trailing</span>
     <span class="doccomment">/// punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty_or_trailing</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
         <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">is_none</span>()
     }

     <span class="doccomment">/// Appends a syntax tree node onto the end of this punctuated sequence.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// If there is not a trailing punctuation in this sequence when this method</span>
     <span class="doccomment">/// is called, the default value of punctuation type `P` is inserted before</span>
     <span class="doccomment">/// the given value of type `T`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>)
     <span class="kw">where</span>
         <span class="ident">P</span>: <span class="ident">Default</span>,
     {
         <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">empty_or_trailing</span>() {
             <span class="self">self</span>.<span class="ident">push_punct</span>(<span class="ident">Default::default</span>());
         }
         <span class="self">self</span>.<span class="ident">push_value</span>(<span class="ident">value</span>);
     }

     <span class="doccomment">/// Inserts an element at position `index`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Panics</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Panics if `index` is greater than the number of elements previously in</span>
     <span class="doccomment">/// this punctuated sequence.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">T</span>)
     <span class="kw">where</span>
         <span class="ident">P</span>: <span class="ident">Default</span>,
     {
         <span class="macro">assert!</span>(
             <span class="ident">index</span> <span class="op">&lt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(),
             <span class="string">&quot;Punctuated::insert: index out of range&quot;</span>,
         );

         <span class="kw">if</span> <span class="ident">index</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>() {
             <span class="self">self</span>.<span class="ident">push</span>(<span class="ident">value</span>);
         } <span class="kw">else</span> {
             <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">insert</span>(<span class="ident">index</span>, (<span class="ident">value</span>, <span class="ident">Default::default</span>()));
         }
     }

     <span class="doccomment">/// Clears the sequence of all values and punctuation, making it empty.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clear</span>();
         <span class="self">self</span>.<span class="ident">last</span> <span class="op">=</span> <span class="prelude-val">None</span>;
     }

     <span class="doccomment">/// Parses zero or more occurrences of `T` separated by punctuation of type</span>
     <span class="doccomment">/// `P`, with optional trailing punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Parsing continues until the end of this parse stream. The entire content</span>
     <span class="doccomment">/// of this parse stream must consist of `T` and `P`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;`</span>
     <span class="doccomment">/// feature.*</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_terminated</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Parse</span>,
         <span class="ident">P</span>: <span class="ident">Parse</span>,
     {
         <span class="ident"><span class="self">Self</span>::parse_terminated_with</span>(<span class="ident">input</span>, <span class="ident">T::parse</span>)
     }

     <span class="doccomment">/// Parses zero or more occurrences of `T` using the given parse function,</span>
     <span class="doccomment">/// separated by punctuation of type `P`, with optional trailing</span>
     <span class="doccomment">/// punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Like [`parse_terminated`], the entire content of this stream is expected</span>
     <span class="doccomment">/// to be parsed.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`parse_terminated`]: Punctuated::parse_terminated</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;`</span>
     <span class="doccomment">/// feature.*</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_terminated_with</span>(
         <span class="ident">input</span>: <span class="ident">ParseStream</span>,
         <span class="ident">parser</span>: <span class="kw">fn</span>(<span class="ident">ParseStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">P</span>: <span class="ident">Parse</span>,
     {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">punctuated</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>();

         <span class="kw">loop</span> {
             <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">is_empty</span>() {
                 <span class="kw">break</span>;
             }
             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
             <span class="ident">punctuated</span>.<span class="ident">push_value</span>(<span class="ident">value</span>);
             <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">is_empty</span>() {
                 <span class="kw">break</span>;
             }
             <span class="kw">let</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
             <span class="ident">punctuated</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>);
         }

         <span class="prelude-val">Ok</span>(<span class="ident">punctuated</span>)
     }

     <span class="doccomment">/// Parses one or more occurrences of `T` separated by punctuation of type</span>
     <span class="doccomment">/// `P`, not accepting trailing punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Parsing continues as long as punctuation `P` is present at the head of</span>
     <span class="doccomment">/// the stream. This method returns upon parsing a `T` and observing that it</span>
     <span class="doccomment">/// is not followed by a `P`, even if there are remaining tokens in the</span>
     <span class="doccomment">/// stream.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;`</span>
     <span class="doccomment">/// feature.*</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_separated_nonempty</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">Parse</span>,
         <span class="ident">P</span>: <span class="ident">Token</span> <span class="op">+</span> <span class="ident">Parse</span>,
     {
         <span class="ident"><span class="self">Self</span>::parse_separated_nonempty_with</span>(<span class="ident">input</span>, <span class="ident">T::parse</span>)
     }

     <span class="doccomment">/// Parses one or more occurrences of `T` using the given parse function,</span>
     <span class="doccomment">/// separated by punctuation of type `P`, not accepting trailing</span>
     <span class="doccomment">/// punctuation.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Like [`parse_separated_nonempty`], may complete early without parsing</span>
     <span class="doccomment">/// the entire content of this stream.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;`</span>
     <span class="doccomment">/// feature.*</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_separated_nonempty_with</span>(
         <span class="ident">input</span>: <span class="ident">ParseStream</span>,
         <span class="ident">parser</span>: <span class="kw">fn</span>(<span class="ident">ParseStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
     ) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">P</span>: <span class="ident">Token</span> <span class="op">+</span> <span class="ident">Parse</span>,
     {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">punctuated</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>();

         <span class="kw">loop</span> {
             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">parser</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
             <span class="ident">punctuated</span>.<span class="ident">push_value</span>(<span class="ident">value</span>);
             <span class="kw">if</span> <span class="op">!</span><span class="ident">P::peek</span>(<span class="ident">input</span>.<span class="ident">cursor</span>()) {
                 <span class="kw">break</span>;
             }
             <span class="kw">let</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
             <span class="ident">punctuated</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>);
         }

         <span class="prelude-val">Ok</span>(<span class="ident">punctuated</span>)
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;clone-impls&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;clone-impls&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Clone</span>,
     <span class="ident">P</span>: <span class="ident">Clone</span>,
 {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">Punctuated</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">clone</span>(),
         }
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Eq</span>,
     <span class="ident">P</span>: <span class="ident">Eq</span>,
 {
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">PartialEq</span>,
     <span class="ident">P</span>: <span class="ident">PartialEq</span>,
 {
     <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; <span class="ident">bool</span> {
         <span class="kw">let</span> <span class="ident">Punctuated</span> { <span class="ident">inner</span>, <span class="ident">last</span> } <span class="op">=</span> <span class="self">self</span>;
         <span class="kw-2">*</span><span class="ident">inner</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">inner</span> <span class="op">&amp;&amp;</span> <span class="kw-2">*</span><span class="ident">last</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">last</span>
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Hash</span>,
     <span class="ident">P</span>: <span class="ident">Hash</span>,
 {
     <span class="kw">fn</span> <span class="ident">hash</span><span class="op">&lt;</span><span class="ident">H</span>: <span class="ident">Hasher</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&amp;mut</span> <span class="ident">H</span>) {
         <span class="kw">let</span> <span class="ident">Punctuated</span> { <span class="ident">inner</span>, <span class="ident">last</span> } <span class="op">=</span> <span class="self">self</span>;
         <span class="ident">inner</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
         <span class="ident">last</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Debug</span>, <span class="ident">P</span>: <span class="ident">Debug</span><span class="op">&gt;</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;mut</span> <span class="ident">fmt::Formatter</span>) -&gt; <span class="ident">fmt::Result</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">list</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_list</span>();
         <span class="kw">for</span> (<span class="ident">t</span>, <span class="ident">p</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span> {
             <span class="ident">list</span>.<span class="ident">entry</span>(<span class="ident">t</span>);
             <span class="ident">list</span>.<span class="ident">entry</span>(<span class="ident">p</span>);
         }
         <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">last</span>) <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">last</span> {
             <span class="ident">list</span>.<span class="ident">entry</span>(<span class="ident">last</span>);
         }
         <span class="ident">list</span>.<span class="ident">finish</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">FromIterator</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">P</span>: <span class="ident">Default</span>,
 {
     <span class="kw">fn</span> <span class="ident">from_iter</span><span class="op">&lt;</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">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">i</span>: <span class="ident">I</span>) -&gt; <span class="self">Self</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>();
         <span class="ident">ret</span>.<span class="ident">extend</span>(<span class="ident">i</span>);
         <span class="ident">ret</span>
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Extend</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">P</span>: <span class="ident">Default</span>,
 {
     <span class="kw">fn</span> <span class="ident">extend</span><span class="op">&lt;</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">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">I</span>) {
         <span class="kw">for</span> <span class="ident">value</span> <span class="kw">in</span> <span class="ident">i</span> {
             <span class="self">self</span>.<span class="ident">push</span>(<span class="ident">value</span>);
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">FromIterator</span><span class="op">&lt;</span><span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">from_iter</span><span class="op">&lt;</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">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">i</span>: <span class="ident">I</span>) -&gt; <span class="self">Self</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>();
         <span class="ident">ret</span>.<span class="ident">extend</span>(<span class="ident">i</span>);
         <span class="ident">ret</span>
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Extend</span><span class="op">&lt;</span><span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">extend</span><span class="op">&lt;</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">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">I</span>) {
         <span class="macro">assert!</span>(
             <span class="self">self</span>.<span class="ident">empty_or_trailing</span>(),
             <span class="string">&quot;Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation&quot;</span>,
         );

         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nomore</span> <span class="op">=</span> <span class="bool-val">false</span>;
         <span class="kw">for</span> <span class="ident">pair</span> <span class="kw">in</span> <span class="ident">i</span> {
             <span class="kw">if</span> <span class="ident">nomore</span> {
                 <span class="macro">panic!</span>(<span class="string">&quot;Punctuated extended with items after a Pair::End&quot;</span>);
             }
             <span class="kw">match</span> <span class="ident">pair</span> {
                 <span class="ident">Pair::Punctuated</span>(<span class="ident">a</span>, <span class="ident">b</span>) =&gt; <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">push</span>((<span class="ident">a</span>, <span class="ident">b</span>)),
                 <span class="ident">Pair::End</span>(<span class="ident">a</span>) =&gt; {
                     <span class="self">self</span>.<span class="ident">last</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box::new</span>(<span class="ident">a</span>));
                     <span class="ident">nomore</span> <span class="op">=</span> <span class="bool-val">true</span>;
                 }
             }
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
     <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) -&gt; <span class="ident"><span class="self">Self</span>::IntoIter</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">elements</span> <span class="op">=</span> <span class="ident">Vec::with_capacity</span>(<span class="self">self</span>.<span class="ident">len</span>());
         <span class="ident">elements</span>.<span class="ident">extend</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="ident">pair</span>.<span class="number">0</span>));
         <span class="ident">elements</span>.<span class="ident">extend</span>(<span class="self">self</span>.<span class="ident">last</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">t</span>));

         <span class="ident">IntoIter</span> {
             <span class="ident">inner</span>: <span class="ident">elements</span>.<span class="ident">into_iter</span>(),
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span>;
     <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) -&gt; <span class="ident"><span class="self">Self</span>::IntoIter</span> {
         <span class="ident">Punctuated::iter</span>(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;
     <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) -&gt; <span class="ident"><span class="self">Self</span>::IntoIter</span> {
         <span class="ident">Punctuated::iter_mut</span>(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">default</span>() -&gt; <span class="self">Self</span> {
         <span class="ident">Punctuated::new</span>()
     }
 }

 <span class="doccomment">/// An iterator over borrowed pairs of type `Pair&lt;&amp;T, &amp;P&gt;`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Pairs</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">P</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">slice::Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, (<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="ident">option::IntoIter</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Pairs</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span>, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">P</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>))
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="ident">Pair::End</span>))
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Pairs</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">last</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="ident">Pair::End</span>)
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>)))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Pairs</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">len</span>()
     }
 }

 <span class="comment">// No Clone bound on T or P.</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Pairs</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">Pairs</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">clone</span>(),
         }
     }
 }

 <span class="doccomment">/// An iterator over mutably borrowed pairs of type `Pair&lt;&amp;mut T, &amp;mut P&gt;`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PairsMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">P</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">slice::IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, (<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="ident">option::IntoIter</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">PairsMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">P</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>))
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="ident">Pair::End</span>))
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">PairsMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">last</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="ident">Pair::End</span>)
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>)))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">PairsMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">len</span>()
     }
 }

 <span class="doccomment">/// An iterator over owned pairs of type `Pair&lt;T, P&gt;`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">vec::IntoIter</span><span class="op">&lt;</span>(<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="ident">option::IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>))
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="ident">Pair::End</span>))
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">last</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="ident">Pair::End</span>)
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">t</span>, <span class="ident">p</span>)<span class="op">|</span> <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>)))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">len</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">IntoPairs</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Clone</span>,
     <span class="ident">P</span>: <span class="ident">Clone</span>,
 {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">IntoPairs</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">clone</span>(),
         }
     }
 }

 <span class="doccomment">/// An iterator over owned values of type `T`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">vec::IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>()
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Clone</span>,
 {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">IntoIter</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
         }
     }
 }

 <span class="doccomment">/// An iterator over borrowed values of type `&amp;T`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="comment">// The `Item = &amp;&#39;a T` needs to be specified to support rustc 1.31 and older.</span>
     <span class="comment">// On modern compilers we would be able to write just IterTrait&lt;&#39;a, T&gt; where</span>
     <span class="comment">// Item can be inferred unambiguously from the supertrait.</span>
     <span class="ident">inner</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">IterTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
 }

 <span class="kw">trait</span> <span class="ident">IterTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span>:
     <span class="ident">DoubleEndedIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span>
 {
     <span class="kw">fn</span> <span class="ident">clone_box</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">IterTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span>;
 }

 <span class="kw">struct</span> <span class="ident">PrivateIter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">P</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">slice::Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, (<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="ident">option::IntoIter</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">empty_punctuated_iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>() -&gt; <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">Iter</span> {
         <span class="ident">inner</span>: <span class="ident">Box::new</span>(<span class="ident">iter::empty</span>()),
     }
 }

 <span class="comment">// No Clone bound on T.</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">Iter</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone_box</span>(),
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>()
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">PrivateIter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="kw-2">&amp;</span><span class="ident">pair</span>.<span class="number">0</span>)
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">next</span>())
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">PrivateIter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">last</span>
             .<span class="ident">next</span>()
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="kw-2">&amp;</span><span class="ident">pair</span>.<span class="number">0</span>))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">PrivateIter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">len</span>()
     }
 }

 <span class="comment">// No Clone bound on T or P.</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">PrivateIter</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="ident">PrivateIter</span> {
             <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>(),
             <span class="ident">last</span>: <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">clone</span>(),
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">I</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IterTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">I</span>
 <span class="kw">where</span>
     <span class="ident">I</span>: <span class="ident">DoubleEndedIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">Clone</span>,
 {
     <span class="kw">fn</span> <span class="ident">clone_box</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">IterTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
         <span class="ident">Box::new</span>(<span class="self">self</span>.<span class="ident">clone</span>())
     }
 }

 <span class="doccomment">/// An iterator over mutably borrowed values of type `&amp;mut T`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">IterMutTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
 }

 <span class="kw">trait</span> <span class="ident">IterMutTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span>:
     <span class="ident">DoubleEndedIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span>
 {
 }

 <span class="kw">struct</span> <span class="ident">PrivateIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">P</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">inner</span>: <span class="ident">slice::IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, (<span class="ident">T</span>, <span class="ident">P</span>)<span class="op">&gt;</span>,
     <span class="ident">last</span>: <span class="ident">option::IntoIter</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span>,
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">empty_punctuated_iter_mut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>() -&gt; <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">IterMut</span> {
         <span class="ident">inner</span>: <span class="ident">Box::new</span>(<span class="ident">iter::empty</span>()),
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>()
     }

     <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
         (<span class="self">self</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">PrivateIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">inner</span>
             .<span class="ident">next</span>()
             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="kw-2">&amp;mut</span> <span class="ident">pair</span>.<span class="number">0</span>)
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">next</span>())
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">PrivateIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident"><span class="self">Self</span>::Item</span><span class="op">&gt;</span> {
         <span class="self">self</span>.<span class="ident">last</span>
             .<span class="ident">next</span>()
             .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pair</span><span class="op">|</span> <span class="kw-2">&amp;mut</span> <span class="ident">pair</span>.<span class="number">0</span>))
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">PrivateIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
         <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">last</span>.<span class="ident">len</span>()
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span>, <span class="ident">I</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IterMutTrait</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">I</span> <span class="kw">where</span>
     <span class="ident">I</span>: <span class="ident">DoubleEndedIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">&gt;</span>
 {
 }

 <span class="doccomment">/// A single syntax tree node of type `T` followed by its trailing punctuation</span>
 <span class="doccomment">/// of type `P` if any.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Refer to the [module documentation] for details about punctuated sequences.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [module documentation]: self</span>
 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="ident">Punctuated</span>(<span class="ident">T</span>, <span class="ident">P</span>),
     <span class="ident">End</span>(<span class="ident">T</span>),
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="doccomment">/// Extracts the syntax tree node from this punctuated pair, discarding the</span>
     <span class="doccomment">/// following punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_value</span>(<span class="self">self</span>) -&gt; <span class="ident">T</span> {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="kw">_</span>) <span class="op">|</span> <span class="ident">Pair::End</span>(<span class="ident">t</span>) =&gt; <span class="ident">t</span>,
         }
     }

     <span class="doccomment">/// Borrows the syntax tree node from this punctuated pair.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="ident">T</span> {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="kw">_</span>) <span class="op">|</span> <span class="ident">Pair::End</span>(<span class="ident">t</span>) =&gt; <span class="ident">t</span>,
         }
     }

     <span class="doccomment">/// Mutably borrows the syntax tree node from this punctuated pair.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut</span> <span class="ident">T</span> {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="kw">_</span>) <span class="op">|</span> <span class="ident">Pair::End</span>(<span class="ident">t</span>) =&gt; <span class="ident">t</span>,
         }
     }

     <span class="doccomment">/// Borrows the punctuation from this punctuated pair, unless this pair is</span>
     <span class="doccomment">/// the final one and there is no trailing punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">punct</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">P</span><span class="op">&gt;</span> {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="kw">_</span>, <span class="ident">p</span>) =&gt; <span class="prelude-val">Some</span>(<span class="ident">p</span>),
             <span class="ident">Pair::End</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Creates a punctuated pair out of a syntax tree node and an optional</span>
     <span class="doccomment">/// following punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">t</span>: <span class="ident">T</span>, <span class="ident">p</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>) -&gt; <span class="self">Self</span> {
         <span class="kw">match</span> <span class="ident">p</span> {
             <span class="prelude-val">Some</span>(<span class="ident">p</span>) =&gt; <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>),
             <span class="prelude-val">None</span> =&gt; <span class="ident">Pair::End</span>(<span class="ident">t</span>),
         }
     }

     <span class="doccomment">/// Produces this punctuated pair as a tuple of syntax tree node and</span>
     <span class="doccomment">/// optional following punctuation.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_tuple</span>(<span class="self">self</span>) -&gt; (<span class="ident">T</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>) {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>) =&gt; (<span class="ident">t</span>, <span class="prelude-val">Some</span>(<span class="ident">p</span>)),
             <span class="ident">Pair::End</span>(<span class="ident">t</span>) =&gt; (<span class="ident">t</span>, <span class="prelude-val">None</span>),
         }
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;clone-impls&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;clone-impls&quot;</span>)))]</span>
 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
 <span class="kw">where</span>
     <span class="ident">T</span>: <span class="ident">Clone</span>,
     <span class="ident">P</span>: <span class="ident">Clone</span>,
 {
     <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
         <span class="kw">match</span> <span class="self">self</span> {
             <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="ident">p</span>) =&gt; <span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>.<span class="ident">clone</span>(), <span class="ident">p</span>.<span class="ident">clone</span>()),
             <span class="ident">Pair::End</span>(<span class="ident">t</span>) =&gt; <span class="ident">Pair::End</span>(<span class="ident">t</span>.<span class="ident">clone</span>()),
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">Index</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">T</span>;

     <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) -&gt; <span class="kw-2">&amp;</span><span class="ident"><span class="self">Self</span>::Output</span> {
         <span class="kw">if</span> <span class="ident">index</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> {
             <span class="kw">match</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">last</span> {
                 <span class="prelude-val">Some</span>(<span class="ident">t</span>) =&gt; <span class="ident">t</span>,
                 <span class="prelude-val">None</span> =&gt; <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>[<span class="ident">index</span>].<span class="number">0</span>,
             }
         } <span class="kw">else</span> {
             <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>[<span class="ident">index</span>].<span class="number">0</span>
         }
     }
 }

 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">IndexMut</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> {
     <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) -&gt; <span class="kw-2">&amp;mut</span> <span class="ident"><span class="self">Self</span>::Output</span> {
         <span class="kw">if</span> <span class="ident">index</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> {
             <span class="kw">match</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">last</span> {
                 <span class="prelude-val">Some</span>(<span class="ident">t</span>) =&gt; <span class="ident">t</span>,
                 <span class="prelude-val">None</span> =&gt; <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">inner</span>[<span class="ident">index</span>].<span class="number">0</span>,
             }
         } <span class="kw">else</span> {
             <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">inner</span>[<span class="ident">index</span>].<span class="number">0</span>
         }
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">printing</span> {
     <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
     <span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>;
     <span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">ToTokens</span>, <span class="ident">TokenStreamExt</span>};

     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>)))]</span>
     <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Punctuated</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">ToTokens</span>,
         <span class="ident">P</span>: <span class="ident">ToTokens</span>,
     {
         <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&amp;mut</span> <span class="ident">TokenStream</span>) {
             <span class="ident">tokens</span>.<span class="ident">append_all</span>(<span class="self">self</span>.<span class="ident">pairs</span>());
         }
     }

     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>)))]</span>
     <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Pair</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">&gt;</span>
     <span class="kw">where</span>
         <span class="ident">T</span>: <span class="ident">ToTokens</span>,
         <span class="ident">P</span>: <span class="ident">ToTokens</span>,
     {
         <span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&amp;mut</span> <span class="ident">TokenStream</span>) {
             <span class="kw">match</span> <span class="self">self</span> {
                 <span class="ident">Pair::Punctuated</span>(<span class="ident">a</span>, <span class="ident">b</span>) =&gt; {
                     <span class="ident">a</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
                     <span class="ident">b</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
                 }
                 <span class="ident">Pair::End</span>(<span class="ident">a</span>) =&gt; <span class="ident">a</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
             }
         }
     }
 }
 </code></pre></div>
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