bad error message

TBR=rsc
DELTA=14  (14 added, 0 deleted, 0 changed)
OCL=29441
CL=29441

test/bugs/bug153.go

+// 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
+
+func f(args ...) {
+}
+
+func main() {
+	f(nil);  // ERROR "nil"
+}

test/golden.out

@@ -108,6 +108,10 @@ BUG: should crash
 bugs/bug149.go:14: cannot convert []uint8 constant to string
 BUG: should compile
 
+=========== bugs/bug153.go
+BUG: errchk: bugs/bug153.go:9: error message does not match 'nil'
+bugs/bug153.go:9: fatal error: dowidth: unknown type: E-34
+
 =========== fixedbugs/bug016.go
 fixedbugs/bug016.go:7: constant -3 overflows uint