test rename overhaul: step 8 - language tests

tests/language/src/StringInterpolation6NegativeTest.dart

-// 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();
-}