gc: handle use of builtin function outside function call

tweaks & tests of last bug fix too.

R=ken2
CC=golang-dev
http://codereview.appspot.com/1207044

2 files changed, 16 insertions, 2 deletions

diff --git a/test/fixedbugs/bug208.go b/test/fixedbugs/bug208.go
index 0a05d80c1..13b040084 100644
--- a/test/fixedbugs/bug208.go
+++ b/test/fixedbugs/bug208.go
@@ -11,10 +11,10 @@ type	T struct
 	f int;
 }
 
-var _ = T{f: 1}
-
 // 6g used to get confused by the f:1 above
 // and allow uses of f that would be silently
 // dropped during the compilation.
 var _ = f;	// ERROR "undefined"
 
+var _ = T{f: 1}
+
diff --git a/test/varerr.go b/test/varerr.go
new file mode 100644
index 000000000..32f33ecc7
--- /dev/null
+++ b/test/varerr.go
@@ -0,0 +1,14 @@
+// errchk $G $D/$F.go
+
+// Copyright 2010 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 main() {
+	_ = asdf	// ERROR "undefined: asdf"
+
+	new = 1	// ERROR "use of builtin new not in function call"
+}
+