test rename overhaul: step 8 - language tests

tests/language/switch7_negative_test.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.
 // Illegal to reference a labeled case stmt with break
 
 class Switch7NegativeTest {
 
   static testMain() {
      var x = 1;
      L: while (true) {
        switch (x) {
          L: case 1: // Shadowing another label is OK.
             break L;  // illegal, can't reference labeled case stmt from break
        }
      }
   }
 }
 
 main() {
   Switch7NegativeTest.testMain();
 }