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Robert Findley a5a423e0e8 go/parser: fix parsing of array or slice constraint types 
Now that we allow eliding 'interface' from constraint types, we need to
be a bit more careful about not consuming a '[' when parsing the next
expression after "type T [". We want to check if the next expression is
an identifier not followed by ']', in which case we're in a generic
type, but need to avoid parsing index or slice expressions. Such
expressions aren't valid array lengths because these expressions are
never constant, so when encountering a following '[' we can instead
assume that this is a type parameter field with array or slice type
constraint.

Test cases are added for the related issues #49174 and #49175, along
with a flag to enable tracing error tests.

For #49174
For #49175

Change-Id: I0476ef20c4c134ac537118272f20caaf123ee70e
Reviewed-on: https://go-review.googlesource.com/c/go/+/359134
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
 		2021-10-28 15:32:59 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/go: stamp VCS revision and uncommitted status into binaries 2021-10-14 18:44:37 +00:00
doc doc/go1.18: document Fossil/Bazaar and commit time build tag support 2021-10-27 21:37:54 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc cmd/go: remove support for -buildmode=shared 2021-10-27 20:03:17 +00:00
src go/parser: fix parsing of array or slice constraint types 2021-10-28 15:32:59 +00:00
test cmd/compile: allow inlining of ORANGE 2021-10-28 14:25:03 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
LICENSE
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README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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