cmd/api: fix no go files package panic

Fixes #29837

Change-Id: I7d57c24d2133932c076df6f41dd6589f777b65dd
Reviewed-on: https://go-review.googlesource.com/c/158877
Run-TryBot: Baokun Lee <nototon@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/cmd/api/goapi_test.go b/src/cmd/api/goapi_test.go
index 1c8e2a345b..fc1bcc908a 100644
--- a/src/cmd/api/goapi_test.go
+++ b/src/cmd/api/goapi_test.go
@@ -203,3 +203,16 @@ func TestIssue21181(t *testing.T) {
 		w.export(pkg)
 	}
 }
+
+func TestIssue29837(t *testing.T) {
+	for _, c := range contexts {
+		c.Compiler = build.Default.Compiler
+	}
+	for _, context := range contexts {
+		w := NewWalker(context, "testdata/src/issue29837")
+		_, err := w.Import("p")
+		if _, nogo := err.(*build.NoGoError); !nogo {
+			t.Errorf("expected *build.NoGoError, got %T", err)
+		}
+	}
+}