diff --git a/test/bugs/bug165.go b/test/bugs/bug165.go
new file mode 100644
index 00000000000..02a6c379b40
--- /dev/null
+++ b/test/bugs/bug165.go
@@ -0,0 +1,11 @@
+// errchk $G $D/$F.go
+
+// Copyright 2009 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 main
+
+type I interface {
+	m(map[I] bool)
+}
diff --git a/test/golden.out b/test/golden.out
index 695a68cd411..09ac96269a0 100644
--- a/test/golden.out
+++ b/test/golden.out
@@ -111,6 +111,10 @@ BUG: should not compile
 =========== bugs/bug164.go
 BUG: should not compile
 
+=========== bugs/bug165.go
+bugs/bug165.go:6: invalid map key type I
+BUG: should compile
+
 =========== fixedbugs/bug016.go
 fixedbugs/bug016.go:7: constant -3 overflows uint