Use identical in token operators.

pkg/front_end/lib/src/fasta/scanner/precedence.dart

 // Copyright (c) 2015, 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.
 
 library fasta.scanner.precedence;
 
 import 'token_constants.dart';
 
 class PrecedenceInfo {
   final String value;
   final int precedence;
   final int kind;
 
   const PrecedenceInfo(this.value, this.precedence, this.kind);
 
   toString() => 'PrecedenceInfo($value, $precedence, $kind)';
+
+  static const List<PrecedenceInfo> all = const <PrecedenceInfo>[
+      BACKPING_INFO,
+      BACKSLASH_INFO,
+      PERIOD_PERIOD_PERIOD_INFO,
+      PERIOD_PERIOD_INFO,
+      BANG_INFO,
+      COLON_INFO,
+      INDEX_INFO,
+      MINUS_MINUS_INFO,
+      PLUS_PLUS_INFO,
+      TILDE_INFO,
+      FUNCTION_INFO,
+      HASH_INFO,
+      INDEX_EQ_INFO,
+      SEMICOLON_INFO,
+      COMMA_INFO,
+      AT_INFO,
+      AMPERSAND_EQ_INFO,
+      BAR_EQ_INFO,
+      CARET_EQ_INFO,
+      EQ_INFO,
+      GT_GT_EQ_INFO,
+      LT_LT_EQ_INFO,
+      MINUS_EQ_INFO,
+      PERCENT_EQ_INFO,
+      PLUS_EQ_INFO,
+      SLASH_EQ_INFO,
+      STAR_EQ_INFO,
+      TILDE_SLASH_EQ_INFO,
+      QUESTION_QUESTION_EQ_INFO,
+      QUESTION_INFO,
+      QUESTION_QUESTION_INFO,
+      BAR_BAR_INFO,
+      AMPERSAND_AMPERSAND_INFO,
+      BAR_INFO,
+      CARET_INFO,
+      AMPERSAND_INFO,
+      BANG_EQ_EQ_INFO,
+      BANG_EQ_INFO,
+      EQ_EQ_EQ_INFO,
+      EQ_EQ_INFO,
+      GT_EQ_INFO,
+      GT_INFO,
+      IS_INFO,
+      AS_INFO,
+      LT_EQ_INFO,
+      LT_INFO,
+      GT_GT_INFO,
+      LT_LT_INFO,
+      MINUS_INFO,
+      PLUS_INFO,
+      PERCENT_INFO,
+      SLASH_INFO,
+      STAR_INFO,
+      TILDE_SLASH_INFO,
+      PERIOD_INFO,
+      QUESTION_PERIOD_INFO,
+      KEYWORD_INFO,
+      EOF_INFO,
+      IDENTIFIER_INFO,
+      BAD_INPUT_INFO,
+      OPEN_PAREN_INFO,
+      CLOSE_PAREN_INFO,
+      OPEN_CURLY_BRACKET_INFO,
+      CLOSE_CURLY_BRACKET_INFO,
+      INT_INFO,
+      STRING_INFO,
+      OPEN_SQUARE_BRACKET_INFO,
+      CLOSE_SQUARE_BRACKET_INFO,
+      DOUBLE_INFO,
+      STRING_INTERPOLATION_INFO,
+      STRING_INTERPOLATION_IDENTIFIER_INFO,
+      HEXADECIMAL_INFO,
+      COMMENT_INFO,
+    ];
 }
 
 // TODO(ahe): The following are not tokens in Dart.
 const PrecedenceInfo BACKPING_INFO =
     const PrecedenceInfo('`', 0, BACKPING_TOKEN);
 const PrecedenceInfo BACKSLASH_INFO =
     const PrecedenceInfo('\\', 0, BACKSLASH_TOKEN);
 const PrecedenceInfo PERIOD_PERIOD_PERIOD_INFO =
     const PrecedenceInfo('...', 0, PERIOD_PERIOD_PERIOD_TOKEN);
 
@@ skipping 162 matching lines @@
     const PrecedenceInfo('\${', 0, STRING_INTERPOLATION_TOKEN);
 
 const PrecedenceInfo STRING_INTERPOLATION_IDENTIFIER_INFO =
     const PrecedenceInfo('\$', 0, STRING_INTERPOLATION_IDENTIFIER_TOKEN);
 
 const PrecedenceInfo HEXADECIMAL_INFO =
     const PrecedenceInfo('hexadecimal', 0, HEXADECIMAL_TOKEN);
 
 const PrecedenceInfo COMMENT_INFO =
     const PrecedenceInfo('comment', 0, COMMENT_TOKEN);