From f03f2ab67a686f44355d4e8b376b6da1ec0de970 Mon Sep 17 00:00:00 2001
From: Neal Patel <nealpatel@google.com>
Date: Thu, 30 Apr 2026 19:30:21 -0400
Subject: [PATCH] go/types: prevent panic with multi-tag, multi-file test
 packages

notag.go
```
package repro
```

tag.go
```
//go:build ignore

package repro
```

Change-Id: I6eb2f61f3434ac575e9081747c8da8aab24f4823
Reviewed-on: https://go-review.googlesource.com/c/go/+/772800
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Nicholas Husin <nsh@golang.org>
Reviewed-by: Nicholas Husin <husin@google.com>
Auto-Submit: Neal Patel <nealpatel@google.com>
---
 src/go/types/check_test.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/go/types/check_test.go b/src/go/types/check_test.go
index a5008e54ba..142d221502 100644
--- a/src/go/types/check_test.go
+++ b/src/go/types/check_test.go
@@ -480,7 +480,7 @@ func testPkg(t *testing.T, filenames []string, manual bool) {
 	if len(fs) == 0 {
 		t.Skip("all files skipped by build tags")
 	}
-	testFiles(t, filenames, srcs, manual)
+	testFiles(t, fs, srcs, manual)
 }
 
 // shouldTest checks build tags in src and returns whether the file