Accept more labels per switch case.

lib/compiler/implementation/typechecker.dart

 // 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.
 
 class TypeCheckerTask extends CompilerTask {
   TypeCheckerTask(Compiler compiler) : super(compiler);
   String get name() => "Type checker";
 
   static final bool LOG_FAILURES = false;
 
@@ skipping 711 matching lines @@
   }
 
   visitSwitchStatement(SwitchStatement node) {
     fail(node);
   }
 
   visitSwitchCase(SwitchCase node) {
     fail(node);
   }
 
+  visitCaseMatch(CaseMatch node) {
+    fail(node);
+  }
+
   visitTryStatement(TryStatement node) {
     fail(node, 'unimplemented');
   }
 
   visitScriptTag(ScriptTag node) {
     fail(node);
   }
 
   visitCatchBlock(CatchBlock node) {
     fail(node);
   }
 
   visitTypedef(Typedef node) {
     fail(node);
   }
 }