std/primitive.never.html"><code>!</code></a> (never type).</p>
</li>
<li>
<p><a href="macro.abort_call_site.html"><code>abort_call_site!</code></a>:</p>
<p>Shortcut for <code>abort!(Span::call_site(), ...)</code>. Expands to <a href="https://doc.rust-lang.org/std/primitive.never.html"><code>!</code></a> (never type).</p>
</li>
<li>
<p><a href="macro.emit_error.html"><code>emit_error!</code></a>:</p>
<p><a href="https://doc.rust-lang.org/proc_macro/struct.Diagnostic.html"><code>proc_macro::Diagnostic</code><