diff --git a/test/bugs/bug151.go b/test/bugs/bug151.go
new file mode 100644
index 0000000000..46546dfe1e
--- /dev/null
+++ b/test/bugs/bug151.go
@@ -0,0 +1,21 @@
+// $G $D/$F.go || echo BUG: bug151
+
+// 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 S string
+
+type Empty interface {}
+
+func (v S) Less(e Empty) bool {
+	return v < e.(S);
+}
+
+/*
+bugs/bug151.go:10: illegal types for operand: CALL
+	string
+	S
+*/
diff --git a/test/golden.out b/test/golden.out
index 4b3221c6ec..7337d648a8 100644
--- a/test/golden.out
+++ b/test/golden.out
@@ -109,6 +109,12 @@ BUG: should compile
 bugs/bug150.go:13: reorder2: too many funcation calls evaluating parameters
 BUG: bug150
 
+=========== bugs/bug151.go
+bugs/bug151.go:10: illegal types for operand: CALL
+	string
+	S
+BUG: bug151
+
 =========== fixedbugs/bug016.go
 fixedbugs/bug016.go:7: constant -3 overflows uint