Handle switch continue

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
@@ skipping 603 matching lines @@
       : super(builder, target) {
     // The switch case indices must match those computed in
     // [KernelSsaBuilder.buildSwitchCaseConstants].
     // Switch indices are 1-based so we can bypass the synthetic loop when no
     // cases match simply by branching on the index (which defaults to null).
     // TODO
     int switchIndex = 1;
     for (ir.SwitchCase switchCase in switchStatement.cases) {
       JumpTarget continueTarget =
           localsMap.getJumpTargetForSwitchCase(switchCase);
-      assert(continueTarget is KernelJumpTarget);
-      targetIndexMap[continueTarget] = switchIndex;
-      assert(builder.jumpTargets[continueTarget] == null);
-      builder.jumpTargets[continueTarget] = this;
+      if (continueTarget != null) {
+        targetIndexMap[continueTarget] = switchIndex;
+        assert(builder.jumpTargets[continueTarget] == null);
+        builder.jumpTargets[continueTarget] = this;
+      }
       switchIndex++;
     }
   }
 }
 
 class KernelAstTypeInferenceMap implements KernelToTypeInferenceMap {
   final KernelAstAdapter _astAdapter;
 
   KernelAstTypeInferenceMap(this._astAdapter);
 
@@ skipping 106 matching lines @@
   TypeMask selectorTypeOf(Selector selector, TypeMask mask) {
     return TypeMaskFactory.inferredTypeForSelector(
         selector, mask, _globalInferenceResults);
   }
 
   TypeMask typeFromNativeBehavior(
       native.NativeBehavior nativeBehavior, ClosedWorld closedWorld) {
     return TypeMaskFactory.fromNativeBehavior(nativeBehavior, closedWorld);
   }
 }