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doc/go1.18: document method set limitation for method selectors

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For #51183.
For #47694.

Change-Id: If47ae074c3cd9f73b2e7f6408749d9a7d56bd8d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/387924
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2022-02-24 15:45:11 -08:00
parent c0840a7c72
commit b8b3196375
1 changed files with 10 additions and 0 deletions
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doc/go1.18.html
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@ -135,6 +135,16 @@ Do not send CLs removing the interior tags from such phrases.
the predeclared functions <code>real</code>, <code>imag</code>, and <code>complex</code>.
We hope to remove this restriction in Go 1.19.
</li>
<li><!-- https://golang.org/issue/51183 -->
The Go compiler currently only supports calling a method <code>m</code> on a value
<code>x</code> of type parameter type <code>P</code> if <code>m</code> is explictly
declared by <code>P</code>'s constraint interface.
Similarly, method values <code>x.m</code> and method expressions
<code>P.m</code> also are only supported if <code>m</code> is explicitly
declared by <code>P</code>, even though <code>m</code> might be in the method set
of <code>P</code> by virtue of the fact that all types in <code>P</code> implement
<code>m</code>. We hope to remove this restriction in Go 1.19.
</li>
<li><!-- https://golang.org/issue/49030 -->
Embedding a type parameter, or a pointer to a type parameter, as
an unnamed field in a struct type is not permitted. Similarly,