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Robert Griesemer 5ba98b9756 go/types, types2: report type mismatch error when conversion is impossible
Rather than reporting an impossible conversion error when mixing an
untyped value with a pointer type in an operation, report a type
mismatch error. This fixes a regression in error quality compared
to pre-1.18.

For the fix, clean up the implementation of canMix, add documentation,
and give it a better name.

Adjust test case for corresponding error code bacause we now get a
better error message (and error code) for the old error code example.

Fixes #57160.

Change-Id: Ib96ce7cbc44db6905fa2f1c90a3769af609e101b
Reviewed-on: https://go-review.googlesource.com/c/go/+/457055
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
2022-12-13 16:52:44 +00:00
.github .github: update issue label for pkgsite-removal 2022-09-07 16:00:20 +00:00
api api: promote next to go1.20 2022-12-07 16:56:12 +00:00
doc doc/go1.20: fix typo 2022-12-12 14:20:13 +00:00
lib/time lib/time: update to 2022g/2022g 2022-12-07 00:25:27 +00:00
misc cmd/cgo: walk {FuncType,TypeSpec}.TypeParams fields 2022-11-30 21:45:10 +00:00
src go/types, types2: report type mismatch error when conversion is impossible 2022-12-13 16:52:44 +00:00
test cmd/compile: fix conditional select rule 2022-12-09 21:38:33 +00:00
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README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
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