Migrating a block of dart 1 tests to dart 2

tests/language_strong/closure3_test.dart

Index: tests/language_strong/closure3_test.dart
diff --git a/tests/language_strong/closure3_test.dart b/tests/language_strong/closure3_test.dart
deleted file mode 100644
index f8053c46c3d269626c8add525cc66156e2ff71f3..0000000000000000000000000000000000000000
--- a/tests/language_strong/closure3_test.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import "package:expect/expect.dart";
-
-// Test that a NoSuchMethodError is thrown even when an expression
-// seems to be free of side-effects.
-
-test(x, y) {
-  (() {
-    x - y;
-  })();
-}
-
-main() {
-  Expect.throws(() {
-    test(null, 2);
-  }, (e) => e is NoSuchMethodError);
-}