cmd/dist: ignore packages with no Go files in BenchmarkAll

This case recently started happening on the builders.
The synctest experiment was recently enabled for some targets (CL 642422).
This caused the list of standard packages to include testing/synctest.
However, BenchmarkAll tests for all configurations;
some did not include testing/synctest. That caused the test to crash.

Change-Id: Icade10af147c2e2bcbac25bf744919083db3e70f
Reviewed-on: https://go-review.googlesource.com/c/go/+/642397
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>

diff --git a/src/cmd/api/api_test.go b/src/cmd/api/api_test.go
index 78482333330bd8bce36d69e385b6e901ecd90a06..cac624af8a6530cb4285157cf3069e513fb27d7e 100644 (file)
--- a/src/cmd/api/api_test.go
+++ b/src/cmd/api/api_test.go
@@ -201,7 +201,10 @@ func BenchmarkAll(b *testing.B) {
                for _, context := range contexts {
                        w := NewWalker(context, filepath.Join(testenv.GOROOT(b), "src"))
                        for _, name := range w.stdPackages {
-                               pkg, _ := w.import_(name)
+                               pkg, err := w.import_(name)
+                               if _, nogo := err.(*build.NoGoError); nogo {
+                                       continue
+                               }
                                w.export(pkg)
                        }
                        w.Features()