1 files changed, 34 insertions, 0 deletions
diff --git a/src/go/doc/comment/std_test.go b/src/go/doc/comment/std_test.go
new file mode 100644
index 0000000..89206e6
--- /dev/null
+++ b/src/go/doc/comment/std_test.go
@@ -0,0 +1,34 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package comment
+
+import (
+	"internal/diff"
+	"internal/testenv"
+	"sort"
+	"strings"
+	"testing"
+)
+
+func TestStd(t *testing.T) {
+	out, err := testenv.Command(t, testenv.GoToolPath(t), "list", "std").CombinedOutput()
+	if err != nil {
+		t.Fatalf("%v\n%s", err, out)
+	}
+
+	var list []string
+	for _, pkg := range strings.Fields(string(out)) {
+		if !strings.Contains(pkg, "/") {
+			list = append(list, pkg)
+		}
+	}
+	sort.Strings(list)
+
+	have := strings.Join(stdPkgs, "\n") + "\n"
+	want := strings.Join(list, "\n") + "\n"
+	if have != want {
+		t.Errorf("stdPkgs is out of date: regenerate with 'go generate'\n%s", diff.Diff("stdPkgs", []byte(have), "want", []byte(want)))
+	}
+}