�就不支持相互递归.
<p>C4的扩展: 增加<code>write</code>, <code>free</code>, <code>memmove</code>支持, <code>main</code> 函数可重入, 多行注释.</a>
<p>C4网址: <a href="https://github.com/rswier/c4" target="_blank">https://github.com/rswier/c4</a>
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