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Robert Griesemer ddb5a42b25 cmd/compile/internal/types2: avoid "declared but not used" errors for invalid code 
Agressively mark all LHS variables in assignments as used if there
is any error in the (entire) assignment. This reduces the number of
spurious "declared but not used" errors in programs that are invalid
in the first place. This behavior is closer to the behavior of the
compiler's original type checker (types1) and lets us remove lines
of the form "_ = variable" just to satisfy test cases. It also makes
more important errors visible by not crowding them out.

Remove the Checker.useLHS function and use Checker.use instead:
useLHS didn't evaluate top-level variables, but we actually want
them to be evaluated in an error scenario so that they are getting
used (and thus we don't get the "declared but not used" error).

Fixes #42937.

Change-Id: Idda460f6b81c66735bf9fd597c54188949bf12b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/351730
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-09-23 19:41:45 +00:00
.github
api [dev.fuzz] all: merge master (65f0d24) into dev.fuzz 2021-09-09 09:23:26 -07:00
doc spec: fix incorrect type in a shift example 2021-09-16 23:13:48 +00:00
lib/time
misc cmd/cgo: add go:notinheap annotation to Windows handle types 2021-09-22 18:10:24 +00:00
src cmd/compile/internal/types2: avoid "declared but not used" errors for invalid code 2021-09-23 19:41:45 +00:00
test cmd/compile/internal/types2: avoid "declared but not used" errors for invalid code 2021-09-23 19:41:45 +00:00
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