bug: non-exported type is accessible in client

R=r
OCL=13736
CL=13738

test/bugs/bug083.dir/bug0.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 bug0
+
+type T0 struct {
+}
+
+export v0
+var v0 T0

test/bugs/bug083.dir/bug1.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 bug1
+
+import "bug0"
+
+var v1 bug0.T0

test/bugs/bug083.go

+// $G $D/$F.dir/bug0.go && errchk $G $D/$F.dir/bug1.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.
+

test/golden.out

@@ -253,6 +253,8 @@ BUG: fails incorrectly
 bugs/bug082.go:7: fatal error: optoas: no entry COM-<int32>INT32
 BUG: fails incorrectly
 
+=========== bugs/bug083.go
+
 =========== fixedbugs/bug000.go
 
 =========== fixedbugs/bug001.go