Issue 87: Allow unicode escapes in regexp flags.

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 3083 matching lines @@
     ReportMessage("unterminated_regexp", Vector<const char*>::empty());
     *ok = false;
     return NULL;
   }
 
   int literal_index = temp_scope_->NextMaterializedLiteralIndex();
 
   if (is_pre_parsing_) {
     // If we're preparsing we just do all the parsing stuff without
     // building anything.
-    scanner_.ScanRegExpFlags();
+    if (!scanner_.ScanRegExpFlags()) {
+      Next();
+      ReportMessage("invalid_regexp_flags", Vector<const char*>::empty());
+      *ok = false;
+      return NULL;
+    }
     Next();
     return NULL;
   }
 
   Handle<String> js_pattern =
       Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED);
   scanner_.ScanRegExpFlags();
   Handle<String> js_flags =
       Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED);
   Next();
@@ skipping 1276 matching lines @@
                        start_position,
                        is_expression);
   return result;
 }
 
 
 #undef NEW
 
 
 } }  // namespace v8::internal