fix bug187 (itself buggy)

R=austin
DELTA=26  (0 added, 26 deleted, 0 changed)
OCL=34294
CL=34317

test/bugs/bug187.go

-// $G $D/$F.go && $L $F.$A && ./$A.out
-
-// 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
-
-import "os"
-
-func main() {
-	// This bug doesn't arise with [...]int, or []interface{} or [3]interface{}.
-	a := [...]interface{} { 1, 2, 3 };
-	n := 0;
-	bug := false;
-	for _, v := range a {
-		if v.(int) != n {
-			println("BUG:", n, v.(int));
-			os.Exit(0);
-		}
-		n++;
-	}
-}

test/golden.out

@@ -151,9 +151,6 @@ BUG: should fail
 =========== bugs/bug169.go
 BUG: errchk: command succeeded unexpectedly
 
-=========== bugs/bug187.go
-BUG: 0 1
-
 =========== bugs/bug190.go
 bugs/bug190.go:11: invalid recursive type []S
 bugs/bug190.go:16: invalid recursive type S