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doc/go1.18: explain changes to compiler error messages
For #47694. For #50954. Change-Id: I3789e145d64025fe2bf787fa5d01a21832903586 Reviewed-on: https://go-review.googlesource.com/c/go/+/381968 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -443,6 +443,14 @@ Do not send CLs removing the interior tags from such phrases.
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new <code>go</code> command <code>-asan</code> option.
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</p>
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<p><!-- https://golang.org/issue/50954 -->
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Because the compiler's type checker was replaced in its entirety to
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support generics, some error messages now may use different wording
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than before. In some cases, pre-Go 1.18 error messages provided more
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detail or were phrased in a more helpful way.
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We intend to address these cases in Go 1.19.
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</p>
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<p> <!-- https://github.com/golang/go/issues/49569 -->
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Because of changes in the compiler related to supporting generics, the
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Go 1.18 compile speed can be roughly 15% slower than the Go 1.17 compile speed.
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