[modules] Improve error messages.

test/mjsunit/modules-fail-cyclic-3.js

Index: test/mjsunit/modules-fail-cyclic-3.js
diff --git a/test/mjsunit/modules-fail-cyclic-3.js b/test/mjsunit/modules-fail-cyclic-3.js
deleted file mode 100644
index a216569fffb2dc30a3981de26a78ee6c5fb70450..0000000000000000000000000000000000000000
--- a/test/mjsunit/modules-fail-cyclic-3.js
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// MODULE
-
-export {a as x} from "modules-skip-cyclic-3.js";
-export {b as y} from "modules-skip-cyclic-3.js";