Throw a dynamic type error instead of a CastError in a type cast with a

runtime/vm/parser.cc

 // 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 7485 matching lines @@
             ParseType(ClassFinalizer::kCanonicalize));
         if (!type.IsInstantiated() &&
             (current_block_->scope->function_level() > 0)) {
           // Make sure that the instantiator is captured.
           CaptureInstantiator();
         }
         right_operand = new TypeNode(type_pos, type);
         // The type is never malformed (mapped to dynamic), but it can be
         // malbounded in checked mode.
         ASSERT(!type.IsMalformed());
-        if (((op_kind == Token::kIS) || (op_kind == Token::kISNOT)) &&
+        if (((op_kind == Token::kIS) || (op_kind == Token::kISNOT) ||
+             (op_kind == Token::kAS)) &&
             type.IsMalbounded()) {
           // Note that a type error is thrown even if the tested value is null
-          // in a type test. However, no cast exception is thrown if the value
-          // is null in a type cast.
+          // in a type test or in a type cast.
           return ThrowTypeError(type_pos, type);
         }
       }
       if (Token::IsRelationalOperator(op_kind)
           || Token::IsTypeTestOperator(op_kind)
           || Token::IsTypeCastOperator(op_kind)
           || Token::IsEqualityOperator(op_kind)) {
         if (Token::IsTypeTestOperator(op_kind) ||
             Token::IsTypeCastOperator(op_kind)) {
           if (!right_operand->AsTypeNode()->type().IsInstantiated()) {
@@ skipping 3105 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart