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<style>
body { margin: 0; }
pre { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
.lifetime { color: #DFAF8F; font-style: italic; }
.comment { color: #7F9F7F; }
.documentation { color: #629755; }
.injected { opacity: 0.65 ; }
.struct, .enum { color: #7CB8BB; }
.enum_variant { color: #BDE0F3; }
.string_literal { color: #CC9393; }
.field { color: #94BFF3; }
.function { color: #93E0E3; }
.function.unsafe { color: #BC8383; }
.operator.unsafe { color: #BC8383; }
.parameter { color: #94BFF3; }
.text { color: #DCDCCC; }
.type { color: #7CB8BB; }
.builtin_type { color: #8CD0D3; }
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.attribute { color: #94BFF3; }
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.bool_literal { color: #BFE6EB; }
.macro { color: #94BFF3; }
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.value_param { color: #DCDCCC; }
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.mutable { text-decoration: underline; }
.escape_sequence { color: #94BFF3; }
.keyword { color: #F0DFAF; font-weight: bold; }
.keyword.unsafe { color: #BC8383; font-weight: bold; }
.control { font-style: italic; }
.unresolved_reference { color: #FC5555; text-decoration: wavy underline; }
</style>
<pre><code><span class="keyword">use</span> <span class="module">inner</span><span class="operator">::</span><span class="punctuation">{</span><span class="self_keyword">self</span> <span class="keyword">as</span> <span class="module declaration">inner_mod</span><span class="punctuation">}</span><span class="punctuation">;</span>
<span class="keyword">mod</span> <span class="module declaration">inner</span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="comment">// Needed for function consuming vs normal</span>
<span class="keyword">pub</span> <span class="keyword">mod</span> <span class="module declaration">marker</span> <span class="punctuation">{</span>
<span class="attribute">#</span><span class="attribute">[</span><span class="function attribute">lang</span><span class="attribute"> </span><span class="operator">=</span><span class="attribute"> </span><span class="string_literal">"copy"</span><span class="attribute">]</span>
<span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration">Copy</span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="keyword">pub</span> <span class="keyword">mod</span> <span class="module declaration">ops</span> <span class="punctuation">{</span>
<span class="attribute">#</span><span class="attribute">[</span><span class="function attribute">lang</span><span class="attribute"> </span><span class="operator">=</span><span class="attribute"> </span><span class="string_literal">"fn_once"</span><span class="attribute">]</span>
<span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration">FnOnce</span><span class="punctuation"><</span><span class="type_param declaration">Args</span><span class="punctuation">></span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="attribute">#</span><span class="attribute">[</span><span class="function attribute">lang</span><span class="attribute"> </span><span class="operator">=</span><span class="attribute"> </span><span class="string_literal">"fn_mut"</span><span class="attribute">]</span>
<span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration">FnMut</span><span class="punctuation"><</span><span class="type_param declaration">Args</span><span class="punctuation">></span><span class="punctuation">:</span> <span class="trait">FnOnce</span><span class="punctuation"><</span><span class="type_param">Args</span><span class="punctuation">></span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="attribute">#</span><span class="attribute">[</span><span class="function attribute">lang</span><span class="attribute"> </span><span class="operator">=</span><span class="attribute"> </span><span class="string_literal">"fn"</span><span class="attribute">]</span>
<span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration">Fn</span><span class="punctuation"><</span><span class="type_param declaration">Args</span><span class="punctuation">></span><span class="punctuation">:</span> <span class="trait">FnMut</span><span class="punctuation"><</span><span class="type_param">Args</span><span class="punctuation">></span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="keyword">struct</span> <span class="struct declaration">Foo</span> <span class="punctuation">{</span>
<span class="keyword">pub</span> <span class="field declaration">x</span><span class="punctuation">:</span> <span class="builtin_type">i32</span><span class="punctuation">,</span>
<span class="keyword">pub</span> <span class="field declaration">y</span><span class="punctuation">:</span> <span class="builtin_type">i32</span><span class="punctuation">,</span>
<span class="punctuation">}</span>
<span class="keyword">trait</span> <span class="trait declaration">Bar</span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">bar</span><span class="punctuation">(</span><span class="operator">&</span><span class="self_keyword">self</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword">impl</span> <span class="trait">Bar</span> <span class="keyword">for</span> <span class="struct">Foo</span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">bar</span><span class="punctuation">(</span><span class="operator">&</span><span class="self_keyword">self</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="punctuation">{</span>
<span class="self_keyword">self</span><span class="operator">.</span><span class="field">x</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="keyword">impl</span> <span class="struct">Foo</span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">baz</span><span class="punctuation">(</span><span class="keyword">mut</span> <span class="self_keyword mutable">self</span><span class="punctuation">,</span> <span class="value_param declaration">f</span><span class="punctuation">:</span> <span class="struct">Foo</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="punctuation">{</span>
<span class="value_param">f</span><span class="operator">.</span><span class="function consuming">baz</span><span class="punctuation">(</span><span class="self_keyword mutable consuming">self</span><span class="punctuation">)</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">qux</span><span class="punctuation">(</span><span class="operator">&</span><span class="keyword">mut</span> <span class="self_keyword mutable">self</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="self_keyword mutable">self</span><span class="operator">.</span><span class="field">x</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">quop</span><span class="punctuation">(</span><span class="operator">&</span><span class="self_keyword">self</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="punctuation">{</span>
<span class="self_keyword">self</span><span class="operator">.</span><span class="field">x</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="attribute">#</span><span class="attribute">[</span><span class="function attribute">derive</span><span class="punctuation">(</span><span class="attribute">Copy</span><span class="punctuation">)</span><span class="attribute">]</span>
<span class="keyword">struct</span> <span class="struct declaration">FooCopy</span> <span class="punctuation">{</span>
<span class="field declaration">x</span><span class="punctuation">:</span> <span class="builtin_type">u32</span><span class="punctuation">,</span>
<span class="punctuation">}</span>
<span class="keyword">impl</span> <span class="struct">FooCopy</span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">baz</span><span class="punctuation">(</span><span class="self_keyword">self</span><span class="punctuation">,</span> <span class="value_param declaration">f</span><span class="punctuation">:</span> <span class="struct">FooCopy</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">u32</span> <span class="punctuation">{</span>
<span class="value_param">f</span><span class="operator">.</span><span class="function">baz</span><span class="punctuation">(</span><span class="self_keyword">self</span><span class="punctuation">)</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">qux</span><span class="punctuation">(</span><span class="operator">&</span><span class="keyword">mut</span> <span class="self_keyword mutable">self</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="self_keyword mutable">self</span><span class="operator">.</span><span class="field">x</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">quop</span><span class="punctuation">(</span><span class="operator">&</span><span class="self_keyword">self</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">u32</span> <span class="punctuation">{</span>
<span class="self_keyword">self</span><span class="operator">.</span><span class="field">x</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="keyword">static</span> <span class="keyword">mut</span> <span class="static declaration mutable unsafe">STATIC_MUT</span><span class="punctuation">:</span> <span class="builtin_type">i32</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="punctuation">;</span>
<span class="keyword">fn</span> <span class="function declaration">foo</span><span class="punctuation"><</span><span class="lifetime declaration">'a</span><span class="punctuation">,</span> <span class="type_param declaration">T</span><span class="punctuation">></span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="type_param">T</span> <span class="punctuation">{</span>
<span class="function">foo</span><span class="operator">::</span><span class="punctuation"><</span><span class="lifetime">'a</span><span class="punctuation">,</span> <span class="builtin_type">i32</span><span class="punctuation">></span><span class="punctuation">(</span><span class="punctuation">)</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">never</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="builtin_type">!</span> <span class="punctuation">{</span>
<span class="keyword control">loop</span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="keyword">use</span> <span class="module">ops</span><span class="operator">::</span><span class="trait">Fn</span><span class="punctuation">;</span>
<span class="keyword">fn</span> <span class="function declaration">baz</span><span class="punctuation"><</span><span class="type_param declaration">F</span><span class="punctuation">:</span> <span class="trait">Fn</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">></span><span class="punctuation">(</span><span class="value_param declaration callable">f</span><span class="punctuation">:</span> <span class="type_param">F</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="value_param callable">f</span><span class="punctuation">(</span><span class="punctuation">)</span>
<span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">foobar</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">-></span> <span class="keyword">impl</span> <span class="unresolved_reference">Copy</span> <span class="punctuation">{</span><span class="punctuation">}</span>
<span class="keyword">fn</span> <span class="function declaration">foo</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="keyword">let</span> <span class="variable declaration">bar</span> <span class="operator">=</span> <span class="function">foobar</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="macro">macro_rules!</span> <span class="macro declaration">def_fn</span> <span class="punctuation">{</span>
<span class="punctuation">(</span><span class="punctuation">$</span><span class="punctuation">(</span><span class="punctuation">$</span>tt<span class="punctuation">:</span>tt<span class="punctuation">)</span><span class="punctuation">*</span><span class="punctuation">)</span> <span class="operator">=</span><span class="punctuation">></span> <span class="punctuation">{</span><span class="punctuation">$</span><span class="punctuation">(</span><span class="punctuation">$</span>tt<span class="punctuation">)</span><span class="punctuation">*</span><span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="macro">def_fn!</span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">bar</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">-</span><span class="operator">></span> <span class="builtin_type">u32</span> <span class="punctuation">{</span>
<span class="numeric_literal">100</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="macro">macro_rules!</span> <span class="macro declaration">noop</span> <span class="punctuation">{</span>
<span class="punctuation">(</span><span class="punctuation">$</span>expr<span class="punctuation">:</span>expr<span class="punctuation">)</span> <span class="operator">=</span><span class="punctuation">></span> <span class="punctuation">{</span>
<span class="punctuation">$</span>expr
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="macro">macro_rules!</span> <span class="macro declaration">keyword_frag</span> <span class="punctuation">{</span>
<span class="punctuation">(</span><span class="punctuation">$</span>type<span class="punctuation">:</span>ty<span class="punctuation">)</span> <span class="operator">=</span><span class="punctuation">></span> <span class="punctuation">(</span><span class="punctuation">$</span>type<span class="punctuation">)</span>
<span class="punctuation">}</span>
<span class="comment">// comment</span>
<span class="keyword">fn</span> <span class="function declaration">main</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="punctuation">{</span>
<span class="macro">println!</span><span class="punctuation">(</span><span class="string_literal">"Hello, {}!"</span><span class="punctuation">,</span> <span class="numeric_literal">92</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">vec</span> <span class="operator">=</span> <span class="unresolved_reference">Vec</span><span class="operator">::</span><span class="unresolved_reference">new</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="keyword control">if</span> <span class="bool_literal">true</span> <span class="punctuation">{</span>
<span class="keyword">let</span> <span class="variable declaration">x</span> <span class="operator">=</span> <span class="numeric_literal">92</span><span class="punctuation">;</span>
<span class="variable mutable">vec</span><span class="operator">.</span><span class="unresolved_reference">push</span><span class="punctuation">(</span><span class="struct">Foo</span> <span class="punctuation">{</span> <span class="field">x</span><span class="punctuation">,</span> <span class="field">y</span><span class="punctuation">:</span> <span class="numeric_literal">1</span> <span class="punctuation">}</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword unsafe">unsafe</span> <span class="punctuation">{</span>
<span class="variable mutable">vec</span><span class="operator">.</span><span class="unresolved_reference">set_len</span><span class="punctuation">(</span><span class="numeric_literal">0</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="static mutable unsafe">STATIC_MUT</span> <span class="operator">=</span> <span class="numeric_literal">1</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword control">for</span> <span class="variable declaration">e</span> <span class="keyword control">in</span> <span class="variable mutable">vec</span> <span class="punctuation">{</span>
<span class="comment">// Do nothing</span>
<span class="punctuation">}</span>
<span class="macro">noop!</span><span class="punctuation">(</span><span class="macro">noop</span><span class="macro">!</span><span class="punctuation">(</span><span class="numeric_literal">1</span><span class="punctuation">)</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">x</span> <span class="operator">=</span> <span class="numeric_literal">42</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration mutable">y</span> <span class="operator">=</span> <span class="operator">&</span><span class="keyword">mut</span> <span class="variable mutable">x</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration">z</span> <span class="operator">=</span> <span class="operator">&</span><span class="variable mutable">y</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="struct">Foo</span> <span class="punctuation">{</span> <span class="field">x</span><span class="punctuation">:</span> <span class="variable declaration">z</span><span class="punctuation">,</span> <span class="field">y</span> <span class="punctuation">}</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="punctuation">{</span> <span class="field">x</span><span class="punctuation">:</span> <span class="variable">z</span><span class="punctuation">,</span> <span class="field">y</span> <span class="punctuation">}</span><span class="punctuation">;</span>
<span class="variable">y</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">foo</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="punctuation">{</span> <span class="field">x</span><span class="punctuation">,</span> <span class="field">y</span><span class="punctuation">:</span> <span class="variable mutable">x</span> <span class="punctuation">}</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration">foo2</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="punctuation">{</span> <span class="field">x</span><span class="punctuation">,</span> <span class="field">y</span><span class="punctuation">:</span> <span class="variable mutable">x</span> <span class="punctuation">}</span><span class="punctuation">;</span>
<span class="variable mutable">foo</span><span class="operator">.</span><span class="function">quop</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="variable mutable">foo</span><span class="operator">.</span><span class="function mutable">qux</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="variable mutable">foo</span><span class="operator">.</span><span class="function consuming">baz</span><span class="punctuation">(</span><span class="variable consuming">foo2</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">copy</span> <span class="operator">=</span> <span class="struct">FooCopy</span> <span class="punctuation">{</span> <span class="field">x</span> <span class="punctuation">}</span><span class="punctuation">;</span>
<span class="variable mutable">copy</span><span class="operator">.</span><span class="function">quop</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="variable mutable">copy</span><span class="operator">.</span><span class="function mutable">qux</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="variable mutable">copy</span><span class="operator">.</span><span class="function">baz</span><span class="punctuation">(</span><span class="variable mutable">copy</span><span class="punctuation">)</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration callable">a</span> <span class="operator">=</span> <span class="punctuation">|</span><span class="value_param declaration">x</span><span class="punctuation">|</span> <span class="value_param">x</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration callable">bar</span> <span class="operator">=</span> <span class="struct">Foo</span><span class="operator">::</span><span class="function">baz</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration">baz</span> <span class="operator">=</span> <span class="numeric_literal">-</span><span class="numeric_literal">42</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="variable declaration">baz</span> <span class="operator">=</span> <span class="operator">-</span><span class="variable">baz</span><span class="punctuation">;</span>
<span class="keyword">let</span> <span class="punctuation">_</span> <span class="operator">=</span> <span class="operator">!</span><span class="bool_literal">true</span><span class="punctuation">;</span>
<span class="punctuation">}</span>
<span class="keyword">enum</span> <span class="enum declaration">Option</span><span class="punctuation"><</span><span class="type_param declaration">T</span><span class="punctuation">></span> <span class="punctuation">{</span>
<span class="enum_variant declaration">Some</span><span class="punctuation">(</span><span class="type_param">T</span><span class="punctuation">)</span><span class="punctuation">,</span>
<span class="enum_variant declaration">None</span><span class="punctuation">,</span>
<span class="punctuation">}</span>
<span class="keyword">use</span> <span class="enum">Option</span><span class="operator">::</span><span class="punctuation">*</span><span class="punctuation">;</span>
<span class="keyword">impl</span><span class="punctuation"><</span><span class="type_param declaration">T</span><span class="punctuation">></span> <span class="enum">Option</span><span class="punctuation"><</span><span class="type_param">T</span><span class="punctuation">></span> <span class="punctuation">{</span>
<span class="keyword">fn</span> <span class="function declaration">and</span><span class="punctuation"><</span><span class="type_param declaration">U</span><span class="punctuation">></span><span class="punctuation">(</span><span class="self_keyword">self</span><span class="punctuation">,</span> <span class="value_param declaration">other</span><span class="punctuation">:</span> <span class="enum">Option</span><span class="punctuation"><</span><span class="type_param">U</span><span class="punctuation">></span><span class="punctuation">)</span> <span class="operator">-></span> <span class="enum">Option</span><span class="punctuation"><</span><span class="punctuation">(</span><span class="type_param">T</span><span class="punctuation">,</span> <span class="type_param">U</span><span class="punctuation">)</span><span class="punctuation">></span> <span class="punctuation">{</span>
<span class="keyword control">match</span> <span class="value_param">other</span> <span class="punctuation">{</span>
<span class="enum_variant">None</span> <span class="operator">=></span> <span class="macro">unimplemented!</span><span class="punctuation">(</span><span class="punctuation">)</span><span class="punctuation">,</span>
<span class="variable declaration">Nope</span> <span class="operator">=></span> <span class="variable">Nope</span><span class="punctuation">,</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span>
<span class="punctuation">}</span></code></pre>
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