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Daniel Martí 97d5cb24b1 cmd/go: add regression test for cryptic vcs errors
On Go 1.11.x, if one ran 'go build' on a main package within a module,
while a needed vcs program like git was missing, a confusing error would
show up:

	build testmod: cannot find module for path rsc.io/quote

The error should instead point at the source of the problem, which is
the missing vcs program. Thankfully, Go 1.12 doesn't have this bug, even
though it doesn't seem like the bug was fixed directly and
intentionally.

To ensure that this particular edge case isn't broken again, add a
regression test. Piggyback on mod_vcs_missing, since it already requires
a missing vcs program and network access.

I double-checked that Go 1.11 fails this test via /usr/bin/go, which is
1.11.3 on my system:

	$ PATH=~/tip/bin go test -v -run Script/mod_vcs_missing
	[...]
	> exec /usr/bin/go build
	[stderr]
	build m: cannot find module for path launchpad.net/gocheck

Fixes #28948.

Change-Id: Iff1bcf77d9f7c11d15935cb87d6f58d7981d33d2
Reviewed-on: https://go-review.googlesource.com/c/155537
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2018-12-22 09:37:04 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api: promote next to go1.12 2018-12-18 21:27:51 +00:00
doc doc: go_mem: clarify Once docs 2018-12-21 21:46:38 +00:00
lib/time lib/time: update tzdata to 2018g 2018-11-28 08:22:56 +00:00
misc cmd/cgo: don't let inserted /*line*/ become a // comment 2018-12-22 00:45:13 +00:00
src cmd/go: add regression test for cryptic vcs errors 2018-12-22 09:37:04 +00:00
test cmd/compile: pad zero-sized stack variables 2018-12-22 01:16:00 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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