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<pre><code><span class="keyword">struct</span> <span class="struct declaration">Cat</span><span class="semicolon">;</span>
<span class="keyword">trait</span> <span class="trait declaration">Animal</span> <span class="brace">{</span>
<span class="keyword">const</span> <span class="constant declaration associated trait">SOUND</span><span class="colon">:</span> <span class="operator">&</span><span class="lifetime">'static</span> <span class="builtin_type">str</span><span class="semicolon">;</span>
<span class="keyword">fn</span> <span class="function declaration associated trait">make_sound</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration">self</span><span class="parenthesis">)</span> <span class="brace">{</span>
<span class="macro">println!</span><span class="parenthesis">(</span><span class="string_literal">"{}"</span><span class="comma">,</span> Self<span class="colon">:</span><span class="colon">:</span>SOUND<span class="parenthesis">)</span><span class="semicolon">;</span>
<span class="brace">}</span>
<span class="brace">}</span>
<span class="keyword">impl</span> <span class="trait">Animal</span> <span class="keyword">for</span> <span class="struct">Cat</span> <span class="brace">{</span>
<span class="keyword">const</span> <span class="constant declaration associated trait">SOUND</span><span class="colon">:</span> <span class="operator">&</span><span class="lifetime">'static</span> <span class="builtin_type">str</span> <span class="operator">=</span> <span class="string_literal">"Meow!"</span><span class="semicolon">;</span>
<span class="brace">}</span>
<span class="keyword">impl</span> <span class="struct">Cat</span> <span class="brace">{</span>
<span class="keyword">const</span> <span class="constant declaration associated">SPEED</span><span class="colon">:</span> <span class="builtin_type">u32</span> <span class="operator">=</span> <span class="numeric_literal">2</span><span class="semicolon">;</span>
<span class="keyword">fn</span> <span class="function declaration static associated">run</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
<span class="brace">}</span>
<span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
<span class="keyword">let</span> <span class="variable declaration">cat</span> <span class="operator">=</span> <span class="struct">Cat</span><span class="semicolon">;</span>
<span class="variable">cat</span><span class="operator">.</span><span class="function associated trait">make_sound</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
<span class="keyword">let</span> <span class="variable declaration">_sound</span> <span class="operator">=</span> <span class="struct">Cat</span><span class="operator">::</span><span class="constant associated trait">SOUND</span><span class="semicolon">;</span>
<span class="keyword">let</span> <span class="variable declaration">_speed</span> <span class="operator">=</span> <span class="struct">Cat</span><span class="operator">::</span><span class="constant associated">SPEED</span><span class="semicolon">;</span>
<span class="struct">Cat</span><span class="operator">::</span><span class="function static associated">run</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
<span class="brace">}</span>
</code></pre>
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