Move parse-fail tests to UI

src/test/ui/parser/circular_modules_main.rs

@@ -0,0 +1,22 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -Z parse-only
+
+#[path = "circular_modules_hello.rs"]
+mod circular_modules_hello; //~ ERROR: circular modules
+
+pub fn hi_str() -> String {
+    "Hi!".to_string()
+}
+
+fn main() {
+    circular_modules_hello::say_hello();
+}