Fixed a few more incompatibilities

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 4159 matching lines @@
   *min_out = min;
   *max_out = max;
   return true;
 }
 
 
 // Upper and lower case letters differ by one bit.
 STATIC_CHECK(('a' ^ 'A') == 0x20);
 
 uc32 RegExpParser::ParseControlLetterEscape() {
-  if (!has_more()) {
-    ReportError(CStrVector("\\c at end of pattern"));
-    return '\0';
-  }
+  if (!has_more())
+    return 'c';
   uc32 letter = current() & ~(0x20);  // Collapse upper and lower case letters.
   if (letter < 'A' || 'Z' < letter) {
     // Non-spec error-correction: "\c" followed by non-control letter is
     // interpreted as an IdentityEscape of 'c'.
     return 'c';
   }
   Advance();
   return letter & 0x1f;  // Remainder modulo 32, per specification.
 }
 
@@ skipping 369 matching lines @@
                        start_position,
                        is_expression);
   return result;
 }
 
 
 #undef NEW
 
 
 } }  // namespace v8::internal