emit_warning.html"><code>emit_warning!</code></a>:</p>
<p>Like <code>emit_error!</code> but emit a warning instead of error. The compilation won't fail
because of warnings.
Expands to <a href="https://doc.rust-lang.org/std/primitive.unit.html"><code>()</code></a> (unit type).</p>
<p><strong>Beware</strong>: warnings are nightly only, they are completely ignored on stable.</p>
</li>
<li>
<p><a href="macro.emit_call_site_error.html"><code>emit_call_site_warning!</code></a>:</p>
<p>Shortcut for <code>emit_warn