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go/types: in TestStdlib, import from source instead of export data

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TestStdlib was failing after running
	rm -r $(go env GOROOT)/pkg/*/cmd
as the builders do when building binary releases.¹

For users who write programs that depend on go/types, it should be
reasonable to run the tests for go/types as part of 'go test all', and
those tests should pass even if they installed Go from a binary
release.

I had originally drafted this as a fallback to import from source only
if the affected packages can't be imported by the default export-data
importer. Unfortunately, I realized that we don't currently have a
builder that tests the actual release (#46900), so it is quite likely
that the fallback path would bit-rot and produce unexpected test
regressions.

So instead, we now unconditionally import from source in TestStdlib.
That makes the test substantially slower (~15s instead of ~5s on my
workstation), but with less risk of regression, and TestStdlib is
skipped in short mode already so short-mode test time is unaffected.

If we change the builders to test the actual release configuration, we
can consider restoring the faster path when export data is available.

¹df58bbac08/cmd/release/release.go (L533-L545)

For #43232

Change-Id: I764ec56926c104053bb2ef23cf258c8f0f773290
Reviewed-on: https://go-review.googlesource.com/c/go/+/330252
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Bryan C. Mills 2021-06-23 00:50:43 -04:00
parent d01bc571f7
commit 5160896c69
1 changed files with 7 additions and 1 deletions
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8
src/go/types/stdlib_test.go
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@ -26,9 +26,15 @@ import (
. "go/types"
)
// The cmd/*/internal packages may have been deleted as part of a binary
// release. Import from source instead.
//
// (See https://golang.org/issue/43232 and
// https://github.com/golang/build/blob/df58bbac082bc87c4a3cdfe336d1ffe60bbaa916/cmd/release/release.go#L533-L545.)
//
// Use the same importer for all std lib tests to
// avoid repeated importing of the same packages.
var stdLibImporter = importer.Default()
var stdLibImporter = importer.ForCompiler(token.NewFileSet(), "source", nil)
func TestStdlib(t *testing.T) {
testenv.MustHaveGoBuild(t)