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doc/go1.18: document behavior of go/types predicates for extended interfaces
For #47694. Change-Id: Ic27193b65ef4b3c0c932107b8731b5f8d3190ad5 Reviewed-on: https://go-review.googlesource.com/c/go/+/383918 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -909,6 +909,19 @@ Do not send CLs removing the interior tags from such phrases.
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field.
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</li>
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</ul>
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<p>
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The predicates
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<a href="/pkg/go/types/#AssignableTo"><code>AssignableTo</code></a>,
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<a href="/pkg/go/types/#ConvertibleTo"><code>ConvertibleTo</code></a>,
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<a href="/pkg/go/types/#Implements"><code>Implements</code></a>,
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<a href="/pkg/go/types/#Identical"><code>Identical</code></a>,
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<a href="/pkg/go/types/#IdenticalIgnoreTags"><code>IdenticalIgnoreTags</code></a>, and
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<a href="/pkg/go/types/#AssertableTo"><code>AssertableTo</code></a>
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now also work with arguments that are or contain generalized interfaces, i.e. interfaces
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that may only be used as type constraints in Go code.
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Note that the behavior of <code>AssertableTo</code> is undefined if the first argument
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is a generalized interface.
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</p>
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</dd>
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</dl>
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