FYI Implementing 'super' keyword

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 2d5ce2f3760bc929fa04eb967c54ef39db691e63..69a1a3c9274cf0b43fc56fafd962031f5050bde7 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -534,6 +534,9 @@ class ParserTraits {
   Expression* ThisExpression(Scope* scope,
                              AstNodeFactory<AstConstructionVisitor>* factory,
                              int pos = RelocInfo::kNoPosition);
+  Expression* SuperReference(Scope* scope,
+                             AstNodeFactory<AstConstructionVisitor>* factory,
+                             int pos = RelocInfo::kNoPosition);
   Literal* ExpressionFromLiteral(
       Token::Value token, int pos, Scanner* scanner,
       AstNodeFactory<AstConstructionVisitor>* factory);