Proper handling of future reserved words in strict and normal mode.

src/scanner-base.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 531 matching lines @@
   bool has_multiline_comment_before_next_;
 };
 
 
 // ----------------------------------------------------------------------------
 // Keyword matching state machine.
 
 class KeywordMatcher {
 //  Incrementally recognize keywords.
 //
+//  We distinguish between normal future reserved words and words that are
+//  considered to be future reserved words only in strict mode as required by
+//  ECMA-262 7.6.1.2.
+//
 //  Recognized as keywords:
 //      break, case, catch, const*, continue, debugger, default, delete, do,
 //      else, finally, false, for, function, if, in, instanceof, new, null,
 //      return, switch, this, throw, true, try, typeof, var, void, while, with.
 //
-//  Recognized as Future Reserved Keywords (normal and strict mode):
-//      class, enum, export, extends, implements, import, interface,
-//      let, package, private, private, protected, public, public,
+//  Recognized as Future Reserved Keywords:
+//      class, enum, export, extends, import, super.
+//
+//  Recognized as Future Reserved Keywords (strict mode only):
+//      implements, interface, let, package, private, protected, public,
 //      static, yield.
 //
 //  *: Actually a "future reserved keyword". It's the only one we are
 //     recognizing outside of ES5 strict mode, the remaining are allowed
 //     as identifiers.
 //
  public:
   KeywordMatcher()
       : state_(INITIAL),
         token_(Token::IDENTIFIER),
@@ skipping 107 matching lines @@
   // keyword with the current prefix).
   const char* keyword_;
   int counter_;
   Token::Value keyword_token_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_BASE_H_