Sloppy-mode let parsing

src/token.h

 // Copyright 2012 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_TOKEN_H_
 #define V8_TOKEN_H_
 
 #include "src/base/logging.h"
 #include "src/globals.h"
 
@@ skipping 148 matching lines @@
   K(LET, "let", 0)                                                   \
   K(STATIC, "static", 0)                                             \
   K(YIELD, "yield", 0)                                               \
   K(SUPER, "super", 0)                                               \
                                                                      \
   /* Illegal token - not able to scan. */                            \
   T(ILLEGAL, "ILLEGAL", 0)                                           \
                                                                      \
   /* Scanner-internal use only. */                                   \
   T(WHITESPACE, NULL, 0)                                             \
+  T(UNINITIALIZED, NULL, 0)                                          \
                                                                      \
   /* ES6 Template Literals */                                        \
   T(TEMPLATE_SPAN, NULL, 0)                                          \
   T(TEMPLATE_TAIL, NULL, 0)
 
 
 class Token {
  public:
   // All token values.
 #define T(name, string, precedence) name,
@@ skipping 134 matching lines @@
  private:
   static const char* const name_[NUM_TOKENS];
   static const char* const string_[NUM_TOKENS];
   static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOKEN_H_