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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::ToTokens</span>;
<span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">Span</span>, <span class="ident">TokenStream</span>};
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Spanned</span> {
<span class="kw">fn</span> <span class="ident">__span</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Span</span>;
}
<span class="kw">impl</span> <span class="ident">Spanned</span> <span class="kw">for</span> <span class="ident">Span</span> {
<span class="kw">fn</span> <span class="ident">__span</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Span</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">&gt;</span> <span class="ident">Spanned</span> <span class="kw">for</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">__span</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Span</span> {
<span class="ident">join_spans</span>(<span class="self">self</span>.<span class="ident">into_token_stream</span>())
}
}
<span class="kw">fn</span> <span class="ident">join_spans</span>(<span class="ident">tokens</span>: <span class="ident">TokenStream</span>) -&gt; <span class="ident">Span</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">tokens</span>.<span class="ident">into_iter</span>().<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">tt</span><span class="op">|</span> {
<span class="comment">// FIXME: This shouldn&#39;t be required, since optimally spans should</span>
<span class="comment">// never be invalid. This filter_map can probably be removed when</span>
<span class="comment">// https://github.com/rust-lang/rust/issues/43081 is resolved.</span>
<span class="kw">let</span> <span class="ident">span</span> <span class="op">=</span> <span class="ident">tt</span>.<span class="ident">span</span>();
<span class="kw">let</span> <span class="ident">debug</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">span</span>);
<span class="kw">if</span> <span class="ident">debug</span>.<span class="ident">ends_with</span>(<span class="string">&quot;bytes(0..0)&quot;</span>) {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="prelude-val">Some</span>(<span class="ident">span</span>)
}
});
<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">iter</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">span</span>) =&gt; <span class="ident">span</span>,
<span class="prelude-val">None</span> =&gt; <span class="kw">return</span> <span class="ident">Span::call_site</span>(),
};
<span class="ident">iter</span>.<span class="ident">fold</span>(<span class="prelude-val">None</span>, <span class="op">|</span><span class="ident">_prev</span>, <span class="ident">next</span><span class="op">|</span> <span class="prelude-val">Some</span>(<span class="ident">next</span>))
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">last</span><span class="op">|</span> <span class="ident">first</span>.<span class="ident">join</span>(<span class="ident">last</span>))
.<span class="ident">unwrap_or</span>(<span class="ident">first</span>)
}
</code></pre></div>
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