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The Go programming language
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Robert Griesemer 33a1a93a92 cmd/compile/internal/syntax: fix parsing of type parameter lists 
The parser cannot distinguish a type parameter list of the form

[P *T ] or
[P (T)]

where T is not a type literal from an array length specification
P*T (product) or P(T) (constant-valued function call) and thus
interprets these forms as the start of array types.

This ambiguity must be resolved explicitly by placing *T inside
an interface, adding a trailing comma, or by leaving parentheses
away where possible.

This CL adjusts the parser such that these forms are
interpreted as (the beginning) of type parameter lists
if the token after P*T or P(T) is a comma, or if T is
a type literal.

This CL also adjusts the printer to print a comma if
necessary to avoid this ambiguity, and adds additional
printer tests.

Fixes #49482

Change-Id: I36328e2a7d9439c39ba0349837c445542549e84e
Reviewed-on: https://go-review.googlesource.com/c/go/+/370774
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2021-12-17 00:14:49 +00:00
.github .github: use multiple issue templates 2021-12-03 18:27:20 +00:00
api api: promote next to go1.18 2021-12-14 17:43:51 +00:00
doc doc/go1.18: discuss embedded build info compatibility 2021-12-15 14:48:19 +00:00
lib/time lib/time, time/tzdata: update to 2021e 2021-11-11 05:16:39 +00:00
misc misc/cgo/testcarchive: log command output more consistently 2021-12-16 22:15:57 +00:00
src cmd/compile/internal/syntax: fix parsing of type parameter lists 2021-12-17 00:14:49 +00:00
test cmd/compile: don't re-typecheck while importing 2021-12-16 00:34:10 +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: add Bharath Kumar Uppala (individual CLA) 2021-11-29 00:57:09 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Bharath Kumar Uppala (individual CLA) 2021-11-29 00:57:09 +00:00
LICENSE
PATENTS
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

README.md

The Go Programming Language

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