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doc/go1.18: document method set limitation for method selectors
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>
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@ -135,6 +135,16 @@ Do not send CLs removing the interior tags from such phrases.
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the predeclared functions <code>real</code>, <code>imag</code>, and <code>complex</code>.
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We hope to remove this restriction in Go 1.19.
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</li>
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<li><!-- https://golang.org/issue/51183 -->
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The Go compiler currently only supports calling a method <code>m</code> on a value
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<code>x</code> of type parameter type <code>P</code> if <code>m</code> is explictly
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declared by <code>P</code>'s constraint interface.
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Similarly, method values <code>x.m</code> and method expressions
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<code>P.m</code> also are only supported if <code>m</code> is explicitly
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declared by <code>P</code>, even though <code>m</code> might be in the method set
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of <code>P</code> by virtue of the fact that all types in <code>P</code> implement
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<code>m</code>. We hope to remove this restriction in Go 1.19.
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</li>
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<li><!-- https://golang.org/issue/49030 -->
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Embedding a type parameter, or a pointer to a type parameter, as
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an unnamed field in a struct type is not permitted. Similarly,
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