- Some of the pre registered classes like Int, Double etc. were not being

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/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 3232 matching lines @@
       orig_type_parameters = cls.type_parameters();
       // A patch class must be given the same name as the class it is patching,
       // otherwise the generic signature classes it defines will not match the
       // patched generic signature classes. Therefore, new signature classes
       // will be introduced and the original ones will not get finalized.
       cls = Class::New(class_name, script_, classname_pos);
       cls.set_library(library_);
     } else {
       // Not patching a class, but it has been found. This must be one of the
       // pre-registered classes from object.cc or a duplicate definition.
-      if (cls.functions() != Object::empty_array().raw()) {
+      if (!(cls.is_prefinalized() ||
+            RawObject::IsTypedDataViewClassId(cls.id()))) {
         ErrorMsg(classname_pos, "class '%s' is already defined",
                  class_name.ToCString());
       }
       // Pre-registered classes need their scripts connected at this time.
       cls.set_script(script_);
     }
   }
   ASSERT(!cls.IsNull());
   ASSERT(cls.functions() == Object::empty_array().raw());
   set_current_class(cls);
@@ skipping 6690 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart