gc: recursive type error

Fixes #245.

R=ken2
https://golang.org/cl/164094
diff --git a/test/fixedbugs/bug224.go b/test/fixedbugs/bug224.go
new file mode 100644
index 0000000..11ee57e
--- /dev/null
+++ b/test/fixedbugs/bug224.go
@@ -0,0 +1,10 @@
+// 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
+
+type T T		// ERROR "recursive"
+