Go 1.22 or newer.
  A future release will bring some of these improvements to traces produced by older
  version of Go.
</p>

<h3 id="vet">Vet</h3>

<h4 id="vet-loopclosure">References to loop variables</h4>

<p><!-- CL 539016, https://go.dev/issue/63888: cmd/vet: do not report variable capture for loop variables with the new lifetime rules -->
  The behavior of the <code>vet</code> tool has changed to match

</p>

<pre class="ebnf">
TypeDecl = "type" ( TypeSpec | "(" { TypeSpec ";" } ")" ) .
TypeSpec = AliasDecl | TypeDef .
</pre>

<h4 id="Alias_declarations">Alias declarations</h4>

<p>
An alias declaration binds an identifier to the given type.
</p>

<pre class="ebnf">
AliasDecl = identifier "=" Type .
</pre>

<p>

The following table describes the minimum language version required for
features introduced after Go 1.
</p>

<h4 id="Go_1.9">Go 1.9</h4>
<ul>
<li>
An <a href="#Alias_declarations">alias declaration</a> may be used to declare an alias name for a type.
</li>
</ul>

<h4 id="Go_1.13">Go 1.13</h4>
<ul>
<li>