- Change "static final" to "static const" in the lib/ directory.

lib/compiler/implementation/scanner/token.dart

 // Copyright (c) 2011, 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.
 
-final int EOF_TOKEN = 0;
+const int EOF_TOKEN = 0;
 
-final int KEYWORD_TOKEN = $k;
-final int IDENTIFIER_TOKEN = $a;
-final int DOUBLE_TOKEN = $d;
-final int INT_TOKEN = $i;
-final int HEXADECIMAL_TOKEN = $x;
-final int STRING_TOKEN = $SQ;
+const int KEYWORD_TOKEN = $k;
+const int IDENTIFIER_TOKEN = $a;
+const int DOUBLE_TOKEN = $d;
+const int INT_TOKEN = $i;
+const int HEXADECIMAL_TOKEN = $x;
+const int STRING_TOKEN = $SQ;
 
-final int AMPERSAND_TOKEN = $AMPERSAND;
-final int BACKPING_TOKEN = $BACKPING;
-final int BACKSLASH_TOKEN = $BACKSLASH;
-final int BANG_TOKEN = $BANG;
-final int BAR_TOKEN = $BAR;
-final int COLON_TOKEN = $COLON;
-final int COMMA_TOKEN = $COMMA;
-final int EQ_TOKEN = $EQ;
-final int GT_TOKEN = $GT;
-final int HASH_TOKEN = $HASH;
-final int OPEN_CURLY_BRACKET_TOKEN = $OPEN_CURLY_BRACKET;
-final int OPEN_SQUARE_BRACKET_TOKEN = $OPEN_SQUARE_BRACKET;
-final int OPEN_PAREN_TOKEN = $OPEN_PAREN;
-final int LT_TOKEN = $LT;
-final int MINUS_TOKEN = $MINUS;
-final int PERIOD_TOKEN = $PERIOD;
-final int PLUS_TOKEN = $PLUS;
-final int QUESTION_TOKEN = $QUESTION;
-final int AT_TOKEN = $AT;
-final int CLOSE_CURLY_BRACKET_TOKEN = $CLOSE_CURLY_BRACKET;
-final int CLOSE_SQUARE_BRACKET_TOKEN = $CLOSE_SQUARE_BRACKET;
-final int CLOSE_PAREN_TOKEN = $CLOSE_PAREN;
-final int SEMICOLON_TOKEN = $SEMICOLON;
-final int SLASH_TOKEN = $SLASH;
-final int TILDE_TOKEN = $TILDE;
-final int STAR_TOKEN = $STAR;
-final int PERCENT_TOKEN = $PERCENT;
-final int CARET_TOKEN = $CARET;
+const int AMPERSAND_TOKEN = $AMPERSAND;
+const int BACKPING_TOKEN = $BACKPING;
+const int BACKSLASH_TOKEN = $BACKSLASH;
+const int BANG_TOKEN = $BANG;
+const int BAR_TOKEN = $BAR;
+const int COLON_TOKEN = $COLON;
+const int COMMA_TOKEN = $COMMA;
+const int EQ_TOKEN = $EQ;
+const int GT_TOKEN = $GT;
+const int HASH_TOKEN = $HASH;
+const int OPEN_CURLY_BRACKET_TOKEN = $OPEN_CURLY_BRACKET;
+const int OPEN_SQUARE_BRACKET_TOKEN = $OPEN_SQUARE_BRACKET;
+const int OPEN_PAREN_TOKEN = $OPEN_PAREN;
+const int LT_TOKEN = $LT;
+const int MINUS_TOKEN = $MINUS;
+const int PERIOD_TOKEN = $PERIOD;
+const int PLUS_TOKEN = $PLUS;
+const int QUESTION_TOKEN = $QUESTION;
+const int AT_TOKEN = $AT;
+const int CLOSE_CURLY_BRACKET_TOKEN = $CLOSE_CURLY_BRACKET;
+const int CLOSE_SQUARE_BRACKET_TOKEN = $CLOSE_SQUARE_BRACKET;
+const int CLOSE_PAREN_TOKEN = $CLOSE_PAREN;
+const int SEMICOLON_TOKEN = $SEMICOLON;
+const int SLASH_TOKEN = $SLASH;
+const int TILDE_TOKEN = $TILDE;
+const int STAR_TOKEN = $STAR;
+const int PERCENT_TOKEN = $PERCENT;
+const int CARET_TOKEN = $CARET;
 
-final int STRING_INTERPOLATION_TOKEN = 128;
-final int LT_EQ_TOKEN = STRING_INTERPOLATION_TOKEN + 1;
-final int FUNCTION_TOKEN = LT_EQ_TOKEN + 1;
-final int SLASH_EQ_TOKEN = FUNCTION_TOKEN + 1;
-final int PERIOD_PERIOD_PERIOD_TOKEN = SLASH_EQ_TOKEN + 1;
-final int PERIOD_PERIOD_TOKEN = PERIOD_PERIOD_PERIOD_TOKEN + 1;
-final int EQ_EQ_EQ_TOKEN = PERIOD_PERIOD_TOKEN + 1;
-final int EQ_EQ_TOKEN = EQ_EQ_EQ_TOKEN + 1;
-final int LT_LT_EQ_TOKEN = EQ_EQ_TOKEN + 1;
-final int LT_LT_TOKEN = LT_LT_EQ_TOKEN + 1;
-final int GT_EQ_TOKEN = LT_LT_TOKEN + 1;
-final int GT_GT_EQ_TOKEN = GT_EQ_TOKEN + 1;
-final int GT_GT_GT_EQ_TOKEN = GT_GT_EQ_TOKEN + 1;
-final int INDEX_EQ_TOKEN = GT_GT_GT_EQ_TOKEN + 1;
-final int INDEX_TOKEN = INDEX_EQ_TOKEN + 1;
-final int BANG_EQ_EQ_TOKEN = INDEX_TOKEN + 1;
-final int BANG_EQ_TOKEN = BANG_EQ_EQ_TOKEN + 1;
-final int AMPERSAND_AMPERSAND_TOKEN = BANG_EQ_TOKEN + 1;
-final int AMPERSAND_EQ_TOKEN = AMPERSAND_AMPERSAND_TOKEN + 1;
-final int BAR_BAR_TOKEN = AMPERSAND_EQ_TOKEN + 1;
-final int BAR_EQ_TOKEN = BAR_BAR_TOKEN + 1;
-final int STAR_EQ_TOKEN = BAR_EQ_TOKEN + 1;
-final int PLUS_PLUS_TOKEN = STAR_EQ_TOKEN + 1;
-final int PLUS_EQ_TOKEN = PLUS_PLUS_TOKEN + 1;
-final int MINUS_MINUS_TOKEN = PLUS_EQ_TOKEN + 1;
-final int MINUS_EQ_TOKEN = MINUS_MINUS_TOKEN + 1;
-final int TILDE_SLASH_EQ_TOKEN = MINUS_EQ_TOKEN + 1;
-final int TILDE_SLASH_TOKEN = TILDE_SLASH_EQ_TOKEN + 1;
-final int PERCENT_EQ_TOKEN = TILDE_SLASH_TOKEN + 1;
-final int GT_GT_TOKEN = PERCENT_EQ_TOKEN + 1;
-final int CARET_EQ_TOKEN = GT_GT_TOKEN + 1;
-final int IS_TOKEN = CARET_EQ_TOKEN + 1;
-final int AS_TOKEN = IS_TOKEN + 1;
-final int COMMENT_TOKEN = AS_TOKEN + 1;
-final int GT_GT_GT_TOKEN = COMMENT_TOKEN + 1;
-final int STRING_INTERPOLATION_IDENTIFIER_TOKEN = COMMENT_TOKEN + 1;
+const int STRING_INTERPOLATION_TOKEN = 128;
+const int LT_EQ_TOKEN = STRING_INTERPOLATION_TOKEN + 1;
+const int FUNCTION_TOKEN = LT_EQ_TOKEN + 1;
+const int SLASH_EQ_TOKEN = FUNCTION_TOKEN + 1;
+const int PERIOD_PERIOD_PERIOD_TOKEN = SLASH_EQ_TOKEN + 1;
+const int PERIOD_PERIOD_TOKEN = PERIOD_PERIOD_PERIOD_TOKEN + 1;
+const int EQ_EQ_EQ_TOKEN = PERIOD_PERIOD_TOKEN + 1;
+const int EQ_EQ_TOKEN = EQ_EQ_EQ_TOKEN + 1;
+const int LT_LT_EQ_TOKEN = EQ_EQ_TOKEN + 1;
+const int LT_LT_TOKEN = LT_LT_EQ_TOKEN + 1;
+const int GT_EQ_TOKEN = LT_LT_TOKEN + 1;
+const int GT_GT_EQ_TOKEN = GT_EQ_TOKEN + 1;
+const int GT_GT_GT_EQ_TOKEN = GT_GT_EQ_TOKEN + 1;
+const int INDEX_EQ_TOKEN = GT_GT_GT_EQ_TOKEN + 1;
+const int INDEX_TOKEN = INDEX_EQ_TOKEN + 1;
+const int BANG_EQ_EQ_TOKEN = INDEX_TOKEN + 1;
+const int BANG_EQ_TOKEN = BANG_EQ_EQ_TOKEN + 1;
+const int AMPERSAND_AMPERSAND_TOKEN = BANG_EQ_TOKEN + 1;
+const int AMPERSAND_EQ_TOKEN = AMPERSAND_AMPERSAND_TOKEN + 1;
+const int BAR_BAR_TOKEN = AMPERSAND_EQ_TOKEN + 1;
+const int BAR_EQ_TOKEN = BAR_BAR_TOKEN + 1;
+const int STAR_EQ_TOKEN = BAR_EQ_TOKEN + 1;
+const int PLUS_PLUS_TOKEN = STAR_EQ_TOKEN + 1;
+const int PLUS_EQ_TOKEN = PLUS_PLUS_TOKEN + 1;
+const int MINUS_MINUS_TOKEN = PLUS_EQ_TOKEN + 1;
+const int MINUS_EQ_TOKEN = MINUS_MINUS_TOKEN + 1;
+const int TILDE_SLASH_EQ_TOKEN = MINUS_EQ_TOKEN + 1;
+const int TILDE_SLASH_TOKEN = TILDE_SLASH_EQ_TOKEN + 1;
+const int PERCENT_EQ_TOKEN = TILDE_SLASH_TOKEN + 1;
+const int GT_GT_TOKEN = PERCENT_EQ_TOKEN + 1;
+const int CARET_EQ_TOKEN = GT_GT_TOKEN + 1;
+const int IS_TOKEN = CARET_EQ_TOKEN + 1;
+const int AS_TOKEN = IS_TOKEN + 1;
+const int COMMENT_TOKEN = AS_TOKEN + 1;
+const int GT_GT_GT_TOKEN = COMMENT_TOKEN + 1;
+const int STRING_INTERPOLATION_IDENTIFIER_TOKEN = COMMENT_TOKEN + 1;
 
 // TODO(ahe): Get rid of this.
-final int UNKNOWN_TOKEN = 1024;
+const int UNKNOWN_TOKEN = 1024;
 
 /**
  * A token that doubles as a linked list.
  */
 class Token {
   /**
    * The precedence info for this token. [info] determines the kind and the
    * precedence level of this token.
    */
   final PrecedenceInfo info;
@@ skipping 189 matching lines @@
   final SourceString value;
   final int precedence;
   final int kind;
 
   const PrecedenceInfo(this.value, this.precedence, this.kind);
 
   toString() => 'PrecedenceInfo($value, $precedence, $kind)';
 }
 
 // TODO(ahe): The following are not tokens in Dart.
-final PrecedenceInfo BACKPING_INFO =
+const PrecedenceInfo BACKPING_INFO =
   const PrecedenceInfo(const SourceString('`'), 0, BACKPING_TOKEN);
-final PrecedenceInfo BACKSLASH_INFO =
+const PrecedenceInfo BACKSLASH_INFO =
   const PrecedenceInfo(const SourceString('\\'), 0, BACKSLASH_TOKEN);
-final PrecedenceInfo PERIOD_PERIOD_PERIOD_INFO =
+const PrecedenceInfo PERIOD_PERIOD_PERIOD_INFO =
   const PrecedenceInfo(const SourceString('...'), 0,
                        PERIOD_PERIOD_PERIOD_TOKEN);
 
 /**
  * The cascade operator has the lowest precedence of any operator
  * except assignment.
  */
-final int CASCADE_PRECEDENCE = 2;
-final PrecedenceInfo PERIOD_PERIOD_INFO =
+const int CASCADE_PRECEDENCE = 2;
+const PrecedenceInfo PERIOD_PERIOD_INFO =
   const PrecedenceInfo(const SourceString('..'), CASCADE_PRECEDENCE,
                        PERIOD_PERIOD_TOKEN);
 
-final PrecedenceInfo BANG_INFO =
+const PrecedenceInfo BANG_INFO =
   const PrecedenceInfo(const SourceString('!'), 0, BANG_TOKEN);
-final PrecedenceInfo COLON_INFO =
+const PrecedenceInfo COLON_INFO =
   const PrecedenceInfo(const SourceString(':'), 0, COLON_TOKEN);
-final PrecedenceInfo INDEX_INFO =
+const PrecedenceInfo INDEX_INFO =
   const PrecedenceInfo(const SourceString('[]'), 0, INDEX_TOKEN);
-final PrecedenceInfo MINUS_MINUS_INFO =
+const PrecedenceInfo MINUS_MINUS_INFO =
   const PrecedenceInfo(const SourceString('--'), POSTFIX_PRECEDENCE,
                        MINUS_MINUS_TOKEN);
-final PrecedenceInfo PLUS_PLUS_INFO =
+const PrecedenceInfo PLUS_PLUS_INFO =
   const PrecedenceInfo(const SourceString('++'), POSTFIX_PRECEDENCE,
                        PLUS_PLUS_TOKEN);
-final PrecedenceInfo TILDE_INFO =
+const PrecedenceInfo TILDE_INFO =
   const PrecedenceInfo(const SourceString('~'), 0, TILDE_TOKEN);
 
-final PrecedenceInfo FUNCTION_INFO =
+const PrecedenceInfo FUNCTION_INFO =
   const PrecedenceInfo(const SourceString('=>'), 0, FUNCTION_TOKEN);
-final PrecedenceInfo HASH_INFO =
+const PrecedenceInfo HASH_INFO =
   const PrecedenceInfo(const SourceString('#'), 0, HASH_TOKEN);
-final PrecedenceInfo INDEX_EQ_INFO =
+const PrecedenceInfo INDEX_EQ_INFO =
   const PrecedenceInfo(const SourceString('[]='), 0, INDEX_EQ_TOKEN);
-final PrecedenceInfo SEMICOLON_INFO =
+const PrecedenceInfo SEMICOLON_INFO =
   const PrecedenceInfo(const SourceString(';'), 0, SEMICOLON_TOKEN);
-final PrecedenceInfo COMMA_INFO =
+const PrecedenceInfo COMMA_INFO =
   const PrecedenceInfo(const SourceString(','), 0, COMMA_TOKEN);
 
-final PrecedenceInfo AT_INFO =
+const PrecedenceInfo AT_INFO =
   const PrecedenceInfo(const SourceString('@'), 0, AT_TOKEN);
 
 // Assignment operators.
-final int ASSIGNMENT_PRECEDENCE = 1;
-final PrecedenceInfo AMPERSAND_EQ_INFO =
+const int ASSIGNMENT_PRECEDENCE = 1;
+const PrecedenceInfo AMPERSAND_EQ_INFO =
   const PrecedenceInfo(const SourceString('&='),
                        ASSIGNMENT_PRECEDENCE, AMPERSAND_EQ_TOKEN);
-final PrecedenceInfo BAR_EQ_INFO =
+const PrecedenceInfo BAR_EQ_INFO =
   const PrecedenceInfo(const SourceString('|='),
                        ASSIGNMENT_PRECEDENCE, BAR_EQ_TOKEN);
-final PrecedenceInfo CARET_EQ_INFO =
+const PrecedenceInfo CARET_EQ_INFO =
   const PrecedenceInfo(const SourceString('^='),
                        ASSIGNMENT_PRECEDENCE, CARET_EQ_TOKEN);
-final PrecedenceInfo EQ_INFO =
+const PrecedenceInfo EQ_INFO =
   const PrecedenceInfo(const SourceString('='),
                        ASSIGNMENT_PRECEDENCE, EQ_TOKEN);
-final PrecedenceInfo GT_GT_EQ_INFO =
+const PrecedenceInfo GT_GT_EQ_INFO =
   const PrecedenceInfo(const SourceString('>>='),
                        ASSIGNMENT_PRECEDENCE, GT_GT_EQ_TOKEN);
-final PrecedenceInfo GT_GT_GT_EQ_INFO =
+const PrecedenceInfo GT_GT_GT_EQ_INFO =
   const PrecedenceInfo(const SourceString('>>>='),
                        ASSIGNMENT_PRECEDENCE, GT_GT_GT_EQ_TOKEN);
-final PrecedenceInfo LT_LT_EQ_INFO =
+const PrecedenceInfo LT_LT_EQ_INFO =
   const PrecedenceInfo(const SourceString('<<='),
                        ASSIGNMENT_PRECEDENCE, LT_LT_EQ_TOKEN);
-final PrecedenceInfo MINUS_EQ_INFO =
+const PrecedenceInfo MINUS_EQ_INFO =
   const PrecedenceInfo(const SourceString('-='),
                        ASSIGNMENT_PRECEDENCE, MINUS_EQ_TOKEN);
-final PrecedenceInfo PERCENT_EQ_INFO =
+const PrecedenceInfo PERCENT_EQ_INFO =
   const PrecedenceInfo(const SourceString('%='),
                        ASSIGNMENT_PRECEDENCE, PERCENT_EQ_TOKEN);
-final PrecedenceInfo PLUS_EQ_INFO =
+const PrecedenceInfo PLUS_EQ_INFO =
   const PrecedenceInfo(const SourceString('+='),
                        ASSIGNMENT_PRECEDENCE, PLUS_EQ_TOKEN);
-final PrecedenceInfo SLASH_EQ_INFO =
+const PrecedenceInfo SLASH_EQ_INFO =
   const PrecedenceInfo(const SourceString('/='),
                        ASSIGNMENT_PRECEDENCE, SLASH_EQ_TOKEN);
-final PrecedenceInfo STAR_EQ_INFO =
+const PrecedenceInfo STAR_EQ_INFO =
   const PrecedenceInfo(const SourceString('*='),
                        ASSIGNMENT_PRECEDENCE, STAR_EQ_TOKEN);
-final PrecedenceInfo TILDE_SLASH_EQ_INFO =
+const PrecedenceInfo TILDE_SLASH_EQ_INFO =
   const PrecedenceInfo(const SourceString('~/='),
                        ASSIGNMENT_PRECEDENCE, TILDE_SLASH_EQ_TOKEN);
 
-final PrecedenceInfo QUESTION_INFO =
+const PrecedenceInfo QUESTION_INFO =
   const PrecedenceInfo(const SourceString('?'), 3, QUESTION_TOKEN);
 
-final PrecedenceInfo BAR_BAR_INFO =
+const PrecedenceInfo BAR_BAR_INFO =
   const PrecedenceInfo(const SourceString('||'), 4, BAR_BAR_TOKEN);
 
-final PrecedenceInfo AMPERSAND_AMPERSAND_INFO =
+const PrecedenceInfo AMPERSAND_AMPERSAND_INFO =
   const PrecedenceInfo(const SourceString('&&'), 5, AMPERSAND_AMPERSAND_TOKEN);
 
-final PrecedenceInfo BAR_INFO =
+const PrecedenceInfo BAR_INFO =
   const PrecedenceInfo(const SourceString('|'), 6, BAR_TOKEN);
 
-final PrecedenceInfo CARET_INFO =
+const PrecedenceInfo CARET_INFO =
   const PrecedenceInfo(const SourceString('^'), 7, CARET_TOKEN);
 
-final PrecedenceInfo AMPERSAND_INFO =
+const PrecedenceInfo AMPERSAND_INFO =
   const PrecedenceInfo(const SourceString('&'), 8, AMPERSAND_TOKEN);
 
 // Equality operators.
-final PrecedenceInfo BANG_EQ_EQ_INFO =
+const PrecedenceInfo BANG_EQ_EQ_INFO =
   const PrecedenceInfo(const SourceString('!=='), 9, BANG_EQ_EQ_TOKEN);
-final PrecedenceInfo BANG_EQ_INFO =
+const PrecedenceInfo BANG_EQ_INFO =
   const PrecedenceInfo(const SourceString('!='), 9, BANG_EQ_TOKEN);
-final PrecedenceInfo EQ_EQ_EQ_INFO =
+const PrecedenceInfo EQ_EQ_EQ_INFO =
   const PrecedenceInfo(const SourceString('==='), 9, EQ_EQ_EQ_TOKEN);
-final PrecedenceInfo EQ_EQ_INFO =
+const PrecedenceInfo EQ_EQ_INFO =
   const PrecedenceInfo(const SourceString('=='), 9, EQ_EQ_TOKEN);
 
 // Relational operators.
-final PrecedenceInfo GT_EQ_INFO =
+const PrecedenceInfo GT_EQ_INFO =
   const PrecedenceInfo(const SourceString('>='), 10, GT_EQ_TOKEN);
-final PrecedenceInfo GT_INFO =
+const PrecedenceInfo GT_INFO =
   const PrecedenceInfo(const SourceString('>'), 10, GT_TOKEN);
-final PrecedenceInfo IS_INFO =
+const PrecedenceInfo IS_INFO =
   const PrecedenceInfo(const SourceString('is'), 10, IS_TOKEN);
-final PrecedenceInfo AS_INFO =
+const PrecedenceInfo AS_INFO =
   const PrecedenceInfo(const SourceString('as'), 10, AS_TOKEN);
-final PrecedenceInfo LT_EQ_INFO =
+const PrecedenceInfo LT_EQ_INFO =
   const PrecedenceInfo(const SourceString('<='), 10, LT_EQ_TOKEN);
-final PrecedenceInfo LT_INFO =
+const PrecedenceInfo LT_INFO =
   const PrecedenceInfo(const SourceString('<'), 10, LT_TOKEN);
 
 // Shift operators.
-final PrecedenceInfo GT_GT_GT_INFO =
+const PrecedenceInfo GT_GT_GT_INFO =
   const PrecedenceInfo(const SourceString('>>>'), 11, GT_GT_GT_TOKEN);
-final PrecedenceInfo GT_GT_INFO =
+const PrecedenceInfo GT_GT_INFO =
   const PrecedenceInfo(const SourceString('>>'), 11, GT_GT_TOKEN);
-final PrecedenceInfo LT_LT_INFO =
+const PrecedenceInfo LT_LT_INFO =
   const PrecedenceInfo(const SourceString('<<'), 11, LT_LT_TOKEN);
 
 // Additive operators.
-final PrecedenceInfo MINUS_INFO =
+const PrecedenceInfo MINUS_INFO =
   const PrecedenceInfo(const SourceString('-'), 12, MINUS_TOKEN);
-final PrecedenceInfo PLUS_INFO =
+const PrecedenceInfo PLUS_INFO =
   const PrecedenceInfo(const SourceString('+'), 12, PLUS_TOKEN);
 
 // Multiplicative operators.
-final PrecedenceInfo PERCENT_INFO =
+const PrecedenceInfo PERCENT_INFO =
   const PrecedenceInfo(const SourceString('%'), 13, PERCENT_TOKEN);
-final PrecedenceInfo SLASH_INFO =
+const PrecedenceInfo SLASH_INFO =
   const PrecedenceInfo(const SourceString('/'), 13, SLASH_TOKEN);
-final PrecedenceInfo STAR_INFO =
+const PrecedenceInfo STAR_INFO =
   const PrecedenceInfo(const SourceString('*'), 13, STAR_TOKEN);
-final PrecedenceInfo TILDE_SLASH_INFO =
+const PrecedenceInfo TILDE_SLASH_INFO =
   const PrecedenceInfo(const SourceString('~/'), 13, TILDE_SLASH_TOKEN);
 
-final int POSTFIX_PRECEDENCE = 14;
-final PrecedenceInfo PERIOD_INFO =
+const int POSTFIX_PRECEDENCE = 14;
+const PrecedenceInfo PERIOD_INFO =
   const PrecedenceInfo(const SourceString('.'), POSTFIX_PRECEDENCE,
                        PERIOD_TOKEN);
 
-final PrecedenceInfo KEYWORD_INFO =
+const PrecedenceInfo KEYWORD_INFO =
   const PrecedenceInfo(const SourceString('keyword'), 0, KEYWORD_TOKEN);
 
-final PrecedenceInfo EOF_INFO =
+const PrecedenceInfo EOF_INFO =
   const PrecedenceInfo(const SourceString('EOF'), 0, EOF_TOKEN);
 
-final PrecedenceInfo IDENTIFIER_INFO =
+const PrecedenceInfo IDENTIFIER_INFO =
   const PrecedenceInfo(const SourceString('identifier'), 0, IDENTIFIER_TOKEN);
 
-final PrecedenceInfo OPEN_PAREN_INFO =
+const PrecedenceInfo OPEN_PAREN_INFO =
   const PrecedenceInfo(const SourceString('('), POSTFIX_PRECEDENCE,
                        OPEN_PAREN_TOKEN);
 
-final PrecedenceInfo CLOSE_PAREN_INFO =
+const PrecedenceInfo CLOSE_PAREN_INFO =
   const PrecedenceInfo(const SourceString(')'), 0, CLOSE_PAREN_TOKEN);
 
-final PrecedenceInfo OPEN_CURLY_BRACKET_INFO =
+const PrecedenceInfo OPEN_CURLY_BRACKET_INFO =
   const PrecedenceInfo(const SourceString('{'), 0, OPEN_CURLY_BRACKET_TOKEN);
 
-final PrecedenceInfo CLOSE_CURLY_BRACKET_INFO =
+const PrecedenceInfo CLOSE_CURLY_BRACKET_INFO =
   const PrecedenceInfo(const SourceString('}'), 0, CLOSE_CURLY_BRACKET_TOKEN);
 
-final PrecedenceInfo INT_INFO =
+const PrecedenceInfo INT_INFO =
   const PrecedenceInfo(const SourceString('int'), 0, INT_TOKEN);
 
-final PrecedenceInfo STRING_INFO =
+const PrecedenceInfo STRING_INFO =
   const PrecedenceInfo(const SourceString('string'), 0, STRING_TOKEN);
 
-final PrecedenceInfo OPEN_SQUARE_BRACKET_INFO =
+const PrecedenceInfo OPEN_SQUARE_BRACKET_INFO =
   const PrecedenceInfo(const SourceString('['), POSTFIX_PRECEDENCE,
                        OPEN_SQUARE_BRACKET_TOKEN);
 
-final PrecedenceInfo CLOSE_SQUARE_BRACKET_INFO =
+const PrecedenceInfo CLOSE_SQUARE_BRACKET_INFO =
   const PrecedenceInfo(const SourceString(']'), 0, CLOSE_SQUARE_BRACKET_TOKEN);
 
-final PrecedenceInfo DOUBLE_INFO =
+const PrecedenceInfo DOUBLE_INFO =
   const PrecedenceInfo(const SourceString('double'), 0, DOUBLE_TOKEN);
 
-final PrecedenceInfo STRING_INTERPOLATION_INFO =
+const PrecedenceInfo STRING_INTERPOLATION_INFO =
   const PrecedenceInfo(const SourceString('\${'), 0,
                        STRING_INTERPOLATION_TOKEN);
 
-final PrecedenceInfo STRING_INTERPOLATION_IDENTIFIER_INFO =
+const PrecedenceInfo STRING_INTERPOLATION_IDENTIFIER_INFO =
   const PrecedenceInfo(const SourceString('\$'), 0,
                        STRING_INTERPOLATION_IDENTIFIER_TOKEN);
 
-final PrecedenceInfo HEXADECIMAL_INFO =
+const PrecedenceInfo HEXADECIMAL_INFO =
   const PrecedenceInfo(const SourceString('hexadecimal'), 0, HEXADECIMAL_TOKEN);
 
-final PrecedenceInfo COMMENT_INFO =
+const PrecedenceInfo COMMENT_INFO =
   const PrecedenceInfo(const SourceString('comment'), 0, COMMENT_TOKEN);
 
 // For reporting lexical errors.
-final PrecedenceInfo ERROR_INFO =
+const PrecedenceInfo ERROR_INFO =
   const PrecedenceInfo(const SourceString('?'), 0, UNKNOWN_TOKEN);