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Robert Griesemer 753ad5e1d5 spec: document that trailing comma is valid after index in index expressions
At parse time we don't know if a[i] is an index expression or a
type (or function) instantiation. Because instantiations accept
a list of type arguments, and argument lists permit a trailing
comma, a[i,] is either an instantiation or index expression.

Document that a trailing comma is permitted in the syntax for
index expressions.

For comparison, the same problem arises with conversions which
cannot be distinguished from function calls at parse time. The
spec also permits a trailing comma for conversions T(x,). The
grammar adjustment is the same (see line 5239).

Fixes #55007.

Change-Id: Ib9101efe52031589eb95a428cc6dff940d939f9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/452618
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
2022-11-23 00:25:08 +00:00
.github .github: update issue label for pkgsite-removal 2022-09-07 16:00:20 +00:00
api crypto/ed25519: implement Ed25519ctx and Ed25519ph with context 2022-11-21 15:23:39 +00:00
doc spec: document that trailing comma is valid after index in index expressions 2022-11-23 00:25:08 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc misc/cgo/testcshared: reapply CL 451816 2022-11-22 02:27:05 +00:00
src cmd/go: fix the DefaultCC check if CC is an absolute file missing an extension on Windows 2022-11-22 21:00:09 +00:00
test cmd/compile: add -d=inlstaticinit debug flag 2022-11-22 01:42:49 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +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
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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