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</pre><pre class="rust ">
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>;
<span class="doccomment">/// Doc-comments are promoted to attributes that have `is_sugared_doc` = true</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Attribute</span> {
<span class="kw">pub</span> <span class="ident">style</span>: <span class="ident">AttrStyle</span>,
<span class="kw">pub</span> <span class="ident">value</span>: <span class="ident">MetaItem</span>,
<span class="kw">pub</span> <span class="ident">is_sugared_doc</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span> <span class="ident">Attribute</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">name</span>()
}
}
<span class="doccomment">/// Distinguishes between Attributes that decorate items and Attributes that</span>
<span class="doccomment">/// are contained as statements within items. These two cases need to be</span>
<span class="doccomment">/// distinguished for pretty-printing.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">AttrStyle</span> {
<span class="doccomment">/// Attribute of the form `#![...]`.</span>
<span class="ident">Outer</span>,
<span class="doccomment">/// Attribute of the form `#[...]`.</span>
<span class="ident">Inner</span>,
}
<span class="doccomment">/// A compile-time attribute item.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">MetaItem</span> {
<span class="doccomment">/// Word meta item.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `test` as in `#[test]`</span>
<span class="ident">Word</span>(<span class="ident">Ident</span>),
<span class="doccomment">/// List meta item.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `derive(..)` as in `#[derive(..)]`</span>
<span class="ident">List</span>(<span class="ident">Ident</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">NestedMetaItem</span><span class="op">></span>),
<span class="doccomment">/// Name-value meta item.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `feature = "foo"` as in `#[feature = "foo"]`</span>
<span class="ident">NameValue</span>(<span class="ident">Ident</span>, <span class="ident">Lit</span>),
}
<span class="kw">impl</span> <span class="ident">MetaItem</span> {
<span class="doccomment">/// Name of the item.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `test` as in `#[test]`, `derive` as in `#[derive(..)]`, and</span>
<span class="doccomment">/// `feature` as in `#[feature = "foo"]`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">MetaItem</span>::<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>) <span class="op">|</span>
<span class="ident">MetaItem</span>::<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, _) <span class="op">|</span>
<span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, _) <span class="op">=></span> <span class="ident">name</span>.<span class="ident">as_ref</span>(),
}
}
}
<span class="doccomment">/// Possible values inside of compile-time attribute lists.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. the '..' in `#[name(..)]`.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">NestedMetaItem</span> {
<span class="doccomment">/// A full `MetaItem`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `Copy` in `#[derive(Copy)]` would be a `MetaItem::Word(Ident::from("Copy"))`.</span>
<span class="ident">MetaItem</span>(<span class="ident">MetaItem</span>),
<span class="doccomment">/// A Rust literal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// E.g. `"name"` in `#[rename("name")]`.</span>
<span class="ident">Literal</span>(<span class="ident">Lit</span>),
}
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">FilterAttrs</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Ret</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Attribute</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">outer</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Ret</span>;
<span class="kw">fn</span> <span class="ident">inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Ret</span>;
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FilterAttrs</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="kw">for</span> <span class="ident">T</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Attribute</span><span class="op">></span>
{
<span class="kw">type</span> <span class="ident">Ret</span> <span class="op">=</span> <span class="ident">iter</span>::<span class="ident">Filter</span><span class="op"><</span><span class="ident">T</span>::<span class="ident">IntoIter</span>, <span class="kw">fn</span>(<span class="op">&&</span><span class="ident">Attribute</span>) <span class="op">-></span> <span class="ident">bool</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">outer</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Ret</span> {
<span class="kw">fn</span> <span class="ident">is_outer</span>(<span class="ident">attr</span>: <span class="op">&&</span><span class="ident">Attribute</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">attr</span>.<span class="ident">style</span> <span class="op">==</span> <span class="ident">AttrStyle</span>::<span class="ident">Outer</span>
}
<span class="self">self</span>.<span class="ident">into_iter</span>().<span class="ident">filter</span>(<span class="ident">is_outer</span>)
}
<span class="kw">fn</span> <span class="ident">inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Ret</span> {
<span class="kw">fn</span> <span class="ident">is_inner</span>(<span class="ident">attr</span>: <span class="op">&&</span><span class="ident">Attribute</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">attr</span>.<span class="ident">style</span> <span class="op">==</span> <span class="ident">AttrStyle</span>::<span class="ident">Inner</span>
}
<span class="self">self</span>.<span class="ident">into_iter</span>().<span class="ident">filter</span>(<span class="ident">is_inner</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parsing</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">ident</span>::<span class="ident">parsing</span>::<span class="ident">ident</span>;
<span class="kw">use</span> <span class="ident">lit</span>::<span class="ident">parsing</span>::<span class="ident">lit</span>;
<span class="kw">use</span> <span class="ident">synom</span>::<span class="ident">space</span>::{<span class="ident">block_comment</span>, <span class="ident">whitespace</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span>
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">inner_attr</span> <span class="op">-></span> <span class="ident">Attribute</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"#"</span>) <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"!"</span>) <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"["</span>) <span class="op">>></span>
<span class="ident">meta_item</span>: <span class="ident">meta_item</span> <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"]"</span>) <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Inner</span>,
<span class="ident">value</span>: <span class="ident">meta_item</span>,
<span class="ident">is_sugared_doc</span>: <span class="bool-val">false</span>,
})
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"//!"</span>) <span class="op">>></span>
<span class="ident">content</span>: <span class="macro">take_until</span><span class="macro">!</span>(<span class="string">"\n"</span>) <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Inner</span>,
<span class="ident">value</span>: <span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(
<span class="string">"doc"</span>.<span class="ident">into</span>(),
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"//!{}"</span>, <span class="ident">content</span>).<span class="ident">into</span>(),
),
<span class="ident">is_sugared_doc</span>: <span class="bool-val">true</span>,
})
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">option</span><span class="macro">!</span>(<span class="ident">whitespace</span>) <span class="op">>></span>
<span class="macro">peek</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/*!"</span>)) <span class="op">>></span>
<span class="ident">com</span>: <span class="ident">block_comment</span> <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Inner</span>,
<span class="ident">value</span>: <span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(
<span class="string">"doc"</span>.<span class="ident">into</span>(),
<span class="ident">com</span>.<span class="ident">into</span>(),
),
<span class="ident">is_sugared_doc</span>: <span class="bool-val">true</span>,
})
)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">outer_attr</span> <span class="op">-></span> <span class="ident">Attribute</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"#"</span>) <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"["</span>) <span class="op">>></span>
<span class="ident">meta_item</span>: <span class="ident">meta_item</span> <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"]"</span>) <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Outer</span>,
<span class="ident">value</span>: <span class="ident">meta_item</span>,
<span class="ident">is_sugared_doc</span>: <span class="bool-val">false</span>,
})
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"///"</span>) <span class="op">>></span>
<span class="macro">not</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/"</span>)) <span class="op">>></span>
<span class="ident">content</span>: <span class="macro">take_until</span><span class="macro">!</span>(<span class="string">"\n"</span>) <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Outer</span>,
<span class="ident">value</span>: <span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(
<span class="string">"doc"</span>.<span class="ident">into</span>(),
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"///{}"</span>, <span class="ident">content</span>).<span class="ident">into</span>(),
),
<span class="ident">is_sugared_doc</span>: <span class="bool-val">true</span>,
})
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">option</span><span class="macro">!</span>(<span class="ident">whitespace</span>) <span class="op">>></span>
<span class="macro">peek</span><span class="macro">!</span>(<span class="macro">tuple</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/**"</span>), <span class="macro">not</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"*"</span>)))) <span class="op">>></span>
<span class="ident">com</span>: <span class="ident">block_comment</span> <span class="op">>></span>
(<span class="ident">Attribute</span> {
<span class="ident">style</span>: <span class="ident">AttrStyle</span>::<span class="ident">Outer</span>,
<span class="ident">value</span>: <span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(
<span class="string">"doc"</span>.<span class="ident">into</span>(),
<span class="ident">com</span>.<span class="ident">into</span>(),
),
<span class="ident">is_sugared_doc</span>: <span class="bool-val">true</span>,
})
)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">meta_item</span> <span class="op">-></span> <span class="ident">MetaItem</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="ident">id</span>: <span class="ident">ident</span> <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"("</span>) <span class="op">>></span>
<span class="ident">inner</span>: <span class="macro">terminated_list</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">","</span>), <span class="ident">nested_meta_item</span>) <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">")"</span>) <span class="op">>></span>
(<span class="ident">MetaItem</span>::<span class="ident">List</span>(<span class="ident">id</span>, <span class="ident">inner</span>))
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="ident">name</span>: <span class="ident">ident</span> <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"="</span>) <span class="op">>></span>
<span class="ident">value</span>: <span class="ident">lit</span> <span class="op">>></span>
(<span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(<span class="ident">name</span>, <span class="ident">value</span>))
)
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">ident</span>, <span class="ident">MetaItem</span>::<span class="ident">Word</span>)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">nested_meta_item</span> <span class="op">-></span> <span class="ident">NestedMetaItem</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="ident">meta_item</span> <span class="op">=></span> { <span class="ident">NestedMetaItem</span>::<span class="ident">MetaItem</span> }
<span class="op">|</span>
<span class="ident">lit</span> <span class="op">=></span> { <span class="ident">NestedMetaItem</span>::<span class="ident">Literal</span> }
));
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</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">lit</span>::{<span class="ident">Lit</span>, <span class="ident">StrStyle</span>};
<span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">Tokens</span>, <span class="ident">ToTokens</span>};
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Attribute</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Attribute</span> { <span class="ident">style</span>,
<span class="ident">value</span>: <span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>,
<span class="ident">Lit</span>::<span class="ident">Str</span>(<span class="kw-2">ref</span> <span class="ident">value</span>, <span class="ident">StrStyle</span>::<span class="ident">Cooked</span>)),
<span class="ident">is_sugared_doc</span>: <span class="bool-val">true</span> } <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"doc"</span> {
<span class="kw">match</span> <span class="ident">style</span> {
<span class="ident">AttrStyle</span>::<span class="ident">Inner</span> <span class="kw">if</span> <span class="ident">value</span>.<span class="ident">starts_with</span>(<span class="string">"//!"</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}\n"</span>, <span class="ident">value</span>));
<span class="kw">return</span>;
}
<span class="ident">AttrStyle</span>::<span class="ident">Inner</span> <span class="kw">if</span> <span class="ident">value</span>.<span class="ident">starts_with</span>(<span class="string">"/*!"</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">value</span>);
<span class="kw">return</span>;
}
<span class="ident">AttrStyle</span>::<span class="ident">Outer</span> <span class="kw">if</span> <span class="ident">value</span>.<span class="ident">starts_with</span>(<span class="string">"///"</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}\n"</span>, <span class="ident">value</span>));
<span class="kw">return</span>;
}
<span class="ident">AttrStyle</span>::<span class="ident">Outer</span> <span class="kw">if</span> <span class="ident">value</span>.<span class="ident">starts_with</span>(<span class="string">"/**"</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">value</span>);
<span class="kw">return</span>;
}
_ <span class="op">=></span> {}
}
}
}
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"#"</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">AttrStyle</span>::<span class="ident">Inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">style</span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"!"</span>);
}
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"["</span>);
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"]"</span>);
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">MetaItem</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">MetaItem</span>::<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">ident</span>) <span class="op">=></span> {
<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">MetaItem</span>::<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">ident</span>, <span class="kw-2">ref</span> <span class="ident">inner</span>) <span class="op">=></span> {
<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"("</span>);
<span class="ident">tokens</span>.<span class="ident">append_separated</span>(<span class="ident">inner</span>, <span class="string">","</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">")"</span>);
}
<span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">value</span>) <span class="op">=></span> {
<span class="ident">name</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"="</span>);
<span class="ident">value</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">NestedMetaItem</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">NestedMetaItem</span>::<span class="ident">MetaItem</span>(<span class="kw-2">ref</span> <span class="ident">nested</span>) <span class="op">=></span> {
<span class="ident">nested</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">NestedMetaItem</span>::<span class="ident">Literal</span>(<span class="kw-2">ref</span> <span class="ident">lit</span>) <span class="op">=></span> {
<span class="ident">lit</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
}
}
}
</pre>
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