FYI Implementing 'super' keyword

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index d1d1c53e0b16979d91c4d233b1dd0e3096e1f1f1..314daabfc9fb440c3d4cdd782716e240e216f4eb 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -652,6 +652,10 @@ class PreParserExpression {
     return PreParserExpression(kThisExpression);
   }
 
+  static PreParserExpression Super() {
+    return PreParserExpression(kSuperExpression);
+  }
+
   static PreParserExpression ThisProperty() {
     return PreParserExpression(kThisPropertyExpression);
   }
@@ -773,7 +777,8 @@ class PreParserExpression {
     kThisExpression = (1 << 4),
     kThisPropertyExpression = (2 << 4),
     kPropertyExpression = (3 << 4),
-    kCallExpression = (4 << 4)
+    kCallExpression = (4 << 4),
+    kSuperExpression = (5 << 4)
   };
 
   explicit PreParserExpression(int expression_code) : code_(expression_code) {}
@@ -1216,6 +1221,11 @@ class PreParserTraits {
     return PreParserExpression::This();
   }
 
+  static PreParserExpression SuperReference(PreParserScope* scope,
+                                            PreParserFactory* factory) {
+    return PreParserExpression::Super();
+  }
+
   static PreParserExpression ExpressionFromLiteral(
       Token::Value token, int pos, Scanner* scanner,
       PreParserFactory* factory) {
@@ -2340,7 +2350,13 @@ ParserBase<Traits>::ParseMemberWithNewPrefixesExpression(bool* ok) {
   if (peek() == Token::NEW) {
     Consume(Token::NEW);
     int new_pos = position();
-    ExpressionT result = this->ParseMemberWithNewPrefixesExpression(CHECK_OK);
+    ExpressionT result = this->EmptyExpression();
+    if (peek() == Token::SUPER) {
+      Consume(Token::SUPER);
+      result = this->SuperReference(scope_, factory());
+    } else {
+      result = this->ParseMemberWithNewPrefixesExpression(CHECK_OK);
+    }
     if (peek() == Token::LPAREN) {
       // NewExpression with arguments.
       typename Traits::Type::ExpressionList args =
@@ -2354,7 +2370,7 @@ ParserBase<Traits>::ParseMemberWithNewPrefixesExpression(bool* ok) {
     return factory()->NewCallNew(result, this->NewExpressionList(0, zone_),
                                  new_pos);
   }
-  // No 'new' keyword.
+  // No 'new' or 'super' keyword.
   return this->ParseMemberExpression(ok);
 }
 
@@ -2395,6 +2411,19 @@ ParserBase<Traits>::ParseMemberExpression(bool* ok) {
                                         function_type,
                                         FunctionLiteral::NORMAL_ARITY,
                                         CHECK_OK);
+  } else if (peek() == Token::SUPER) {
+    int beg_pos = position();
+    Consume(Token::SUPER);
+    Token::Value next = peek();
+    if (next == Token::PERIOD || next == Token::LBRACK ||
+        next == Token::LPAREN) {
+      result = this->SuperReference(scope_, factory());
+    } else {
+      ReportMessageAt(Scanner::Location(beg_pos, position()),
+                      "unexpected_super");
+      *ok = false;
+      return this->EmptyExpression();
+    }
   } else {
     result = ParsePrimaryExpression(CHECK_OK);
   }