[parser] report errors for invalid binding patterns in async formal parameters

src/parsing/expression-classifier.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_EXPRESSION_CLASSIFIER_H
 #define V8_PARSING_EXPRESSION_CLASSIFIER_H
 
 #include "src/messages.h"
 #include "src/parsing/scanner.h"
 #include "src/parsing/token.h"
@@ skipping 232 matching lines @@
   }
 
   void RecordBindingPatternError(const Scanner::Location& loc,
                                  MessageTemplate::Template message,
                                  const char* arg = nullptr) {
     if (!is_valid_binding_pattern()) return;
     invalid_productions_ |= BindingPatternProduction;
     Add(Error(loc, message, kBindingPatternProduction, arg));
   }
 
+  void ReplaceBindingPatternError(const Scanner::Location& loc,
+                                  MessageTemplate::Template message,
+                                  const char* arg = nullptr) {
+    if (!is_valid_binding_pattern()) {
+      Error& e = reported_error(kBindingPatternProduction);
+      e.location = loc;
+      e.message = message;
+      e.arg = arg;
+    } else {
+      RecordBindingPatternError(loc, message, arg);
+    }
+  }
+
   void RecordAssignmentPatternError(const Scanner::Location& loc,
                                     MessageTemplate::Template message,
                                     const char* arg = nullptr) {
     if (!is_valid_assignment_pattern()) return;
     invalid_productions_ |= AssignmentPatternProduction;
     Add(Error(loc, message, kAssignmentPatternProduction, arg));
   }
 
   void RecordPatternError(const Scanner::Location& loc,
                           MessageTemplate::Template message,
@@ skipping 231 matching lines @@
 };
 
 
 #undef ERROR_CODES
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_EXPRESSION_CLASSIFIER_H