Cascading errors lead to a compiler crash.

R=rsc
DELTA=18  (18 added, 0 deleted, 0 changed)
OCL=33914
CL=33917

test/bugs/bug198.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(a T) T {	return a }	// ERROR "T"
+func main() {
+	x := f(0);
+}

test/golden.out

@@ -174,3 +174,10 @@ BUG should compile and run
 too many calls: 5
 panic PC=xxx
 BUG: bug196
+
+=========== bugs/bug198.go
+bugs/bug198.go:8: undefined: T
+bugs/bug198.go:8: T is not a type
+bugs/bug198.go:8: too many arguments to return
+bugs/bug198.go:10: too many arguments to CALL
+BUG: errchk: compiler crashed