constant keys for array initializers

R=ken
OCL=32261
CL=32261
diff --git a/test/fixedbugs/bug176.go b/test/fixedbugs/bug176.go
new file mode 100644
index 0000000..5820df3
--- /dev/null
+++ b/test/fixedbugs/bug176.go
@@ -0,0 +1,14 @@
+// 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
+
+var x int
+
+var a = []int{ x: 1}	// ERROR "constant"
+var b = [...]int{ x : 1}	// ERROR "constant"
+var c = map[int]int{ x: 1}
+