Remove assertion expansion.

src/parser.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4174 matching lines @@
 CharacterRange RegExpParser::ParseClassAtom(uc16* char_class) {
   ASSERT_EQ(0, *char_class);
   uc32 first = current();
   if (first == '\\') {
     switch (Next()) {
       case 'w': case 'W': case 'd': case 'D': case 's': case 'S': {
         *char_class = Next();
         Advance(2);
         return CharacterRange::Singleton(0);  // Return dummy value.
       }
+      case kEndMarker:
+        ReportError(CStrVector("\\ at end of pattern") CHECK_FAILED);
       default:
         uc32 c = ParseClassCharacterEscape(CHECK_FAILED);
         return CharacterRange::Singleton(c);
     }
   } else {
     Advance();
     return CharacterRange::Singleton(first);
   }
 }
 
@@ skipping 171 matching lines @@
                        start_position,
                        is_expression);
   return result;
 }
 
 
 #undef NEW
 
 
 } }  // namespace v8::internal