Version 4.6.85.5 (cherry-pick)

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 18fc2330eedd7f646683035bba73e311d6f8d12a..f8f20e530aa18d2f7e4c8c1d892470d33dc662c6 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -2988,6 +2988,7 @@ ParserBase<Traits>::ParseConditionalExpression(bool accept_IN,
   ExpressionT expression =
       this->ParseBinaryExpression(4, accept_IN, classifier, CHECK_OK);
   if (peek() != Token::CONDITIONAL) return expression;
+  ArrowFormalParametersUnexpectedToken(classifier);
   BindingPatternUnexpectedToken(classifier);
   Consume(Token::CONDITIONAL);
   // In parsing the first assignment expression in conditional
@@ -3013,6 +3014,7 @@ ParserBase<Traits>::ParseBinaryExpression(int prec, bool accept_IN,
     // prec1 >= 4
     while (Precedence(peek(), accept_IN) == prec1) {
       BindingPatternUnexpectedToken(classifier);
+      ArrowFormalParametersUnexpectedToken(classifier);
       Token::Value op = Next();
       Scanner::Location op_location = scanner()->location();
       int pos = position();
@@ -3075,6 +3077,7 @@ ParserBase<Traits>::ParseUnaryExpression(ExpressionClassifier* classifier,
   Token::Value op = peek();
   if (Token::IsUnaryOp(op)) {
     BindingPatternUnexpectedToken(classifier);
+    ArrowFormalParametersUnexpectedToken(classifier);
 
     op = Next();
     int pos = position();
@@ -3097,6 +3100,7 @@ ParserBase<Traits>::ParseUnaryExpression(ExpressionClassifier* classifier,
     return this->BuildUnaryExpression(expression, op, pos, factory());
   } else if (Token::IsCountOp(op)) {
     BindingPatternUnexpectedToken(classifier);
+    ArrowFormalParametersUnexpectedToken(classifier);
     op = Next();
     int beg_pos = peek_position();
     ExpressionT expression = this->ParseUnaryExpression(classifier, CHECK_OK);
@@ -3129,6 +3133,7 @@ ParserBase<Traits>::ParsePostfixExpression(ExpressionClassifier* classifier,
   if (!scanner()->HasAnyLineTerminatorBeforeNext() &&
       Token::IsCountOp(peek())) {
     BindingPatternUnexpectedToken(classifier);
+    ArrowFormalParametersUnexpectedToken(classifier);
 
     expression = this->CheckAndRewriteReferenceExpression(
         expression, lhs_beg_pos, scanner()->location().end_pos,
@@ -3160,6 +3165,7 @@ ParserBase<Traits>::ParseLeftHandSideExpression(
     switch (peek()) {
       case Token::LBRACK: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
         Consume(Token::LBRACK);
         int pos = position();
         ExpressionT index = ParseExpression(true, classifier, CHECK_OK);
@@ -3170,6 +3176,7 @@ ParserBase<Traits>::ParseLeftHandSideExpression(
 
       case Token::LPAREN: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
 
         if (is_strong(language_mode()) && this->IsIdentifier(result) &&
             this->IsEval(this->AsIdentifier(result))) {
@@ -3231,6 +3238,7 @@ ParserBase<Traits>::ParseLeftHandSideExpression(
 
       case Token::PERIOD: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
         Consume(Token::PERIOD);
         int pos = position();
         IdentifierT name = ParseIdentifierName(CHECK_OK);
@@ -3243,6 +3251,7 @@ ParserBase<Traits>::ParseLeftHandSideExpression(
       case Token::TEMPLATE_SPAN:
       case Token::TEMPLATE_TAIL: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
         result = ParseTemplateLiteral(result, position(), classifier, CHECK_OK);
         break;
       }
@@ -3280,6 +3289,7 @@ ParserBase<Traits>::ParseMemberWithNewPrefixesExpression(
 
   if (peek() == Token::NEW) {
     BindingPatternUnexpectedToken(classifier);
+    ArrowFormalParametersUnexpectedToken(classifier);
     Consume(Token::NEW);
     int new_pos = position();
     ExpressionT result = this->EmptyExpression();
@@ -3333,6 +3343,7 @@ ParserBase<Traits>::ParseMemberExpression(ExpressionClassifier* classifier,
   ExpressionT result = this->EmptyExpression();
   if (peek() == Token::FUNCTION) {
     BindingPatternUnexpectedToken(classifier);
+    ArrowFormalParametersUnexpectedToken(classifier);
 
     Consume(Token::FUNCTION);
     int function_token_position = position();
@@ -3576,6 +3587,7 @@ ParserBase<Traits>::ParseMemberExpressionContinuation(
     switch (peek()) {
       case Token::LBRACK: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
 
         Consume(Token::LBRACK);
         int pos = position();
@@ -3589,6 +3601,7 @@ ParserBase<Traits>::ParseMemberExpressionContinuation(
       }
       case Token::PERIOD: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
 
         Consume(Token::PERIOD);
         int pos = position();
@@ -3603,6 +3616,7 @@ ParserBase<Traits>::ParseMemberExpressionContinuation(
       case Token::TEMPLATE_SPAN:
       case Token::TEMPLATE_TAIL: {
         BindingPatternUnexpectedToken(classifier);
+        ArrowFormalParametersUnexpectedToken(classifier);
         int pos;
         if (scanner()->current_token() == Token::IDENTIFIER) {
           pos = position();