Implement continue for switch.

tests/language/nested_switch_label_test.dart

+// Copyright (c) 2013, 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.
+
+// Test nested switch statement using labels.
+
+library nested_switch_label;
+
+import "package:expect/expect.dart";
+
+void main() {
+  doSwitch(0, ['0', '2:0', '1', 'default']);
+  doSwitch(2, ['2:2', '2:1', '2', '1', 'default']);
+}
+
+void doSwitch(int target, List expect) {
+  List list = [];
+  switch (target) {
+  outer0: case 0:
+    list.add('0');
+    continue outer2;
+  outer1: case 1:
+    list.add('1');
+    continue outerDefault;
+  outer2: case 2:
+    switch (target) {
+    inner0: case 0:
+      list.add('2:0');
+      continue outer1;
+    inner2: case 2:
+      list.add('2:2');
+      continue inner1;
+    inner1: case 1:
+      list.add('2:1');
+    }
+    list.add('2');
+    continue outer1;
+  outerDefault: default:
+    list.add('default');
+  }
+  Expect.listEquals(expect, list);
+}