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<br>
<table><tr><td><hr>
<b>Note:</b> <i>As of Rust 1.45 this crate is superseded by native support
@@ -26,15 +26,15 @@ The function signature is the same as for ordinary function-like procedural
macros.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">proc_macro</span>::<span class="ident">TokenStream</span>;
<span class="kw">use</span> <span class="ident">proc_macro_hack</span>::<span class="ident">proc_macro_hack</span>;
<span class="kw">use</span> <span class="ident">quote</span>::<span class="ident">quote</span>;
<span class="kw">use</span> <span class="ident">proc_macro::TokenStream</span>;
<span class="kw">use</span> <span class="ident">proc_macro_hack::proc_macro_hack</span>;
<span class="kw">use</span> <span class="ident">quote::quote</span>;
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">parse_macro_input</span>, <span class="ident">Expr</span>};
<span class="attribute">#[<span class="ident">proc_macro_hack</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_one</span>(<span class="ident">input</span>: <span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="macro">parse_macro_input</span><span class="macro">!</span>(<span class="ident">input</span> <span class="kw">as</span> <span class="ident">Expr</span>);
<span class="ident">TokenStream</span>::<span class="ident">from</span>(<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="macro">parse_macro_input!</span>(<span class="ident">input</span> <span class="kw">as</span> <span class="ident">Expr</span>);
<span class="ident">TokenStream::from</span>(<span class="macro">quote!</span> {
<span class="number">1</span> <span class="op">+</span> (#<span class="ident">expr</span>)
})
}</pre></div>
@@ -47,13 +47,13 @@ procedural macro from the implementation crate. The re-export also carries a
#[proc_macro_hack] attribute.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">proc_macro_hack</span>::<span class="ident">proc_macro_hack</span>;
<span class="kw">use</span> <span class="ident">proc_macro_hack::proc_macro_hack</span>;
<span class="doccomment">/// Add one to an expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// (Documentation goes here on the re-export, not in the other crate.)</span>
<span class="attribute">#[<span class="ident">proc_macro_hack</span>]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">demo_hack_impl</span>::<span class="ident">add_one</span>;</pre></div>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">demo_hack_impl::add_one</span>;</pre></div>
<p>Both crates depend on <code>proc-macro-hack</code>:</p>
<pre><code class="language-toml">[dependencies]
proc-macro-hack = &quot;0.5&quot;
@@ -69,12 +69,12 @@ implementation crate), then use your procedural macros as usual.</p>
<p><a href="https://github.com/dtolnay/proc-macro-hack/tree/master/example">» example of a downstream crate</a></p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">demo_hack</span>::<span class="ident">add_one</span>;
<span class="kw">use</span> <span class="ident">demo_hack::add_one</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">two</span> <span class="op">=</span> <span class="number">2</span>;
<span class="kw">let</span> <span class="ident">nine</span> <span class="op">=</span> <span class="macro">add_one</span><span class="macro">!</span>(<span class="ident">two</span>) <span class="op">+</span> <span class="macro">add_one</span><span class="macro">!</span>(<span class="number">2</span> <span class="op">+</span> <span class="number">3</span>);
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;nine = {}&quot;</span>, <span class="ident">nine</span>);
<span class="kw">let</span> <span class="ident">nine</span> <span class="op">=</span> <span class="macro">add_one!</span>(<span class="ident">two</span>) <span class="op">+</span> <span class="macro">add_one!</span>(<span class="number">2</span> <span class="op">+</span> <span class="number">3</span>);
<span class="macro">println!</span>(<span class="string">&quot;nine = {}&quot;</span>, <span class="ident">nine</span>);
}</pre></div>
<h1 id="limitations" class="section-header"><a href="#limitations">Limitations</a></h1>
<ul>
@@ -106,5 +106,5 @@ declaration crate.</p>
</li>
</ul>
</div><h2 id="attributes" class="section-header"><a href="#attributes">Attribute Macros</a></h2>
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