fix method function type compare bug (again)

R=ken
OCL=17819
CL=17819
diff --git a/test/method1.go b/test/method1.go
new file mode 100644
index 0000000..f25eb30
--- /dev/null
+++ b/test/method1.go
@@ -0,0 +1,18 @@
+// 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 T struct { }
+func (t *T) M(int, string);
+func (t *T) M(int, float) { }   // ERROR "redeclared"
+
+func f(int, string);
+func f(int, float) { }  // ERROR "redeclared"
+
+func g(a int, b string);
+func g(a int, c string);  // ERROR "names changed"
+