ode class="filename">&lt;bits/std_mutex.h&gt;</code> has to be
renamed from <code class="filename">&lt;bits/mutex.h&gt;</code>.
Another solution would be to rename <code class="filename">bits</code>
to (e.g.) <code class="filename">cppbits</code>.
</p><p>
In files throughout the system, lines marked with an "XXX" indicate
a bug or incompletely-implemented feature.  Lines marked "XXX MT"
indicate a place that may require attention for multi-thread safety.
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