Issue 87: Allow unicode escapes in regexp flags.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index a8f7623918bfa0f224d01c358354b4bf743fc5bf..0a5fa312dc3f0cadbd8700a6c852e8bfc60c0bd4 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3101,7 +3101,12 @@ Expression* Parser::ParseRegExpLiteral(bool seen_equal, bool* ok) {
   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;
   }