Fix string_interpolation tests.

tests/language/string_interpolation6_negative_test.dart

Index: tests/language/string_interpolation6_negative_test.dart
diff --git a/tests/language/string_interpolation6_negative_test.dart b/tests/language/string_interpolation6_negative_test.dart
deleted file mode 100644
index e90545fc1b1faefada5133c83448dd0278c68d97..0000000000000000000000000000000000000000
--- a/tests/language/string_interpolation6_negative_test.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2011, 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.
-
-// A dollar must be followed by a "{" or an identifier.
-
-class StringInterpolation6NegativeTest {
-  testMain() {
-    // Dollar not followed by "{" or identifier.
-    String regexp = "^(\\d\\d?)[-/](\\d\\d?)$";
-    print(regexp);
-  }
-}
-
-main() {
-  StringInterpolation6NegativeTest.testMain();
-}