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doc: document cmd/vet changes for generics in 1.18

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Fixes #50011
Updates #47694

Change-Id: Id3d43f2f72de61b360b79c2b375ca1372d5f4692
Reviewed-on: https://go-review.googlesource.com/c/go/+/369979
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Tim King <taking@google.com>
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Robert Findley 2021-12-07 14:29:21 -05:00
parent 61011de1af
commit 9e29dd42df
1 changed files with 22 additions and 0 deletions
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@ -266,6 +266,28 @@ Do not send CLs removing the interior tags from such phrases.
multiple CPUs, <code>gofmt</code> should now be significantly faster.
</p>
<h3 id="vet"><code>vet</code></h3>
<h4 id="vet-generics">Updates for Generics</h4>
<p><!-- https://golang.org/issue/48704 -->
The <code>vet</code> tool is updated to support generic code. In most cases,
it reports an error in generic code whenever it would report an error in the
equivalent non-generic code after substituting for type parameters with a
type from their
<a href="https://golang.org/ref/spec#Interface_types">type set</a>.
For example, <code>vet</code> reports a format error in
<pre>func Print[T ~int|~string](t T) {
fmt.Printf("%d", t)
}</pre>
because it would report a format error in the non-generic equivalent of
<code>Print[string]</code>:
<pre>func PrintString(x string) {
fmt.Printf("%d", x)
}</pre>
</p>
<h2 id="runtime">Runtime</h2>
<p><!-- https://golang.org/issue/44167 -->