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doc/go1.18: document type parameter name restriction
For #47694. Change-Id: I00862f987a0ff9f71e0295ce4320e6f9a6a4332f Reviewed-on: https://go-review.googlesource.com/c/go/+/376414 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -108,6 +108,12 @@ Do not send CLs removing the interior tags from such phrases.
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interface type with a non-empty method set. Whether this will
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ever be permitted is unclear at present.
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</li>
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<li><!-- https://golang.org/issue/50481 -->
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A generic type or function currently may declare at most one blank (<code>_</code>)
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type parameter name. Note that it is always possible to use an arbitrary new
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(unused) identifier in place of a blank type parameter name.
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We plan to remove this restriction in Go 1.19.
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</li>
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</ul>
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</p>
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