- filed bug: label names in different scopes should not conflict

R=r
OCL=13430
CL=13430

test/bugs/bug076.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func f() {
+exit:
+}
+
+
+func main() {
+exit:  // this should be legal (labels not properly scoped?)
+}
+
+/*
+uetli:~/Source/go/test/bugs gri$ 6g bug076.go 
+bug076.go:11: label redeclared: exit
+*/