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Russ Cox 9aa6f80ed3 go/importer: support lookup in importer.For
The support in this CL assumes that something at a higher level than
the toolchain-specific importers is taking care of converting imports
in source code into canonical import paths before invoking the
toolchain-specific importers. That kind of "what does an import mean"
as opposed to "find me the import data for this specific path"
should be provided by higher-level layers.

That's a different layering than the default behavior but matches the
current layering in the compiler and linker and works with the metadata
planned for generation by the go command for package management.
It should also eventually allow the importer code to stop concerning
itself with source directories and vendor import translation and maybe
deprecate ImporterFrom in favor of Importer once again. But that's all
in the future. For now, just make non-nil lookups work, and test that.

Fixes #13847.
Adds #22550.

Change-Id: I048c6a384492e634988a7317942667689ae680ff
Reviewed-on: https://go-review.googlesource.com/74354
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2017-10-31 16:24:26 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api api: update next.txt 2017-10-28 00:00:56 +00:00
doc spec: match syntax for method expressions with implementations 2017-10-25 22:49:03 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc test/run: use go tool compile + link instead of go run when possible 2017-10-31 13:21:05 +00:00
src go/importer: support lookup in importer.For 2017-10-31 16:24:26 +00:00
test test/run: use go tool compile + link instead of go run when possible 2017-10-31 13:21:05 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +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: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
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