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<p>Query the coroutine's stack region. </p>
<dl class="section warning"><dt>Warning</dt><dd>This function may not be supported by some backends. Some backends may also embed their control structures into the stack at context creation time, which are not safe to overwrite. Do not use this function unless you fully understand what you're doing.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>A pointer to the 