Remove support for + prefix in number literals

runtime/vm/token.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_TOKEN_H_
 #define VM_TOKEN_H_
 
 #include "platform/assert.h"
 
 namespace dart {
@@ skipping 61 matching lines @@
   TOK(kBIT_AND, "&", 8, kNoAttribute)                                          \
   TOK(kBIT_NOT, "~", 0, kNoAttribute)                                          \
                                                                                \
   /* Shift operators. */                                                       \
   TOK(kSHL, "<<", 11, kNoAttribute)                                            \
   TOK(kSHR, ">>", 11, kNoAttribute)                                            \
                                                                                \
   /* Additive operators. */                                                    \
   TOK(kADD, "+", 12, kNoAttribute)                                             \
   TOK(kSUB, "-", 12, kNoAttribute)                                             \
-  /* A 'plus' without a trailing whitespace (handle literals). */              \
-  TOK(kTIGHTADD, "+", 12, kNoAttribute)                                        \
                                                                                \
   /* Multiplicative operators */                                               \
   TOK(kMUL, "*", 13, kNoAttribute)                                             \
   TOK(kDIV, "/", 13, kNoAttribute)                                             \
   TOK(kTRUNCDIV, "~/", 13, kNoAttribute)                                       \
   TOK(kMOD, "%", 13, kNoAttribute)                                             \
                                                                                \
   TOK(kNOT, "!", 0, kNoAttribute)                                              \
   TOK(kCONDITIONAL, "?", 3, kNoAttribute)                                      \
                                                                                \
@@ skipping 219 matching lines @@
   static const char* name_[];
   static const char* tok_str_[];
   static const uint8_t precedence_[];
   static const Attribute attributes_[];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_TOKEN_H_