Make test of malformed types a dynamic type error.

sdk/lib/_internal/compiler/implementation/compile_time_constants.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.
 
 part of dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 96 matching lines @@
 
       SendSet assignment = node.asSendSet();
       Constant value;
       if (assignment == null) {
         // No initial value.
         value = new NullConstant();
       } else {
         Node right = assignment.arguments.head;
         value =
             compileNodeWithDefinitions(right, definitions, isConst: isConst);
-        if (compiler.enableTypeAssertions
-            && value != null
-            && element.isField()) {
+        if (compiler.enableTypeAssertions &&
+            value != null &&
+            element.isField()) {
           DartType elementType = element.computeType(compiler);
-          DartType constantType = value.computeType(compiler);
-          if (!constantSystem.isSubtype(compiler, constantType, elementType)) {
+          if (elementType.kind == TypeKind.MALFORMED_TYPE && !value.isNull()) {
             if (isConst) {
+              ErroneousElement element = elementType.element;
               compiler.reportFatalError(
-                  node, MessageKind.NOT_ASSIGNABLE.error,
-                  {'fromType': constantType, 'toType': elementType});
+                  node, element.messageKind, element.messageArguments);
             } else {
-              // If the field cannot be lazily initialized, we will throw
-              // the exception at runtime.
+              // We need to throw an exception at runtime.
               value = null;
             }
+          } else {
+            DartType constantType = value.computeType(compiler);
+            if (!constantSystem.isSubtype(compiler,
+                                          constantType, elementType)) {
+              if (isConst) {
+                compiler.reportFatalError(
+                    node, MessageKind.NOT_ASSIGNABLE.error,
+                    {'fromType': constantType, 'toType': elementType});
+              } else {
+                // If the field cannot be lazily initialized, we will throw
+                // the exception at runtime.
+                value = null;
+              }
+            }
           }
         }
       }
       if (value != null) {
         initialVariableValues[element] = value;
       } else {
         assert(!isConst);
         lazyStatics.add(element);
       }
       pendingVariables.remove(element);
@@ skipping 809 matching lines @@
           if (fieldValue == null) {
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeSuperAndInjectedMembers: true);
     return jsNewArguments;
   }
 }