Create a special PrecedenceInfo for use during parser recovery.

pkg/front_end/lib/src/fasta/scanner/token_constants.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.token_constants;
 
 import 'characters.dart';
 
 const int EOF_TOKEN = 0;
 
 const int KEYWORD_TOKEN = $k;
 const int IDENTIFIER_TOKEN = $a;
 const int SCRIPT_TOKEN = $b;
 const int BAD_INPUT_TOKEN = $X;
 const int DOUBLE_TOKEN = $d;
 const int INT_TOKEN = $i;
+const int RECOVERY_TOKEN = $r;
 const int HEXADECIMAL_TOKEN = $x;
 const int STRING_TOKEN = $SQ;
 
 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;
@@ skipping 47 matching lines @@
 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 COMMENT_TOKEN = CARET_EQ_TOKEN + 1;
 const int STRING_INTERPOLATION_IDENTIFIER_TOKEN = COMMENT_TOKEN + 1;
 const int QUESTION_PERIOD_TOKEN = STRING_INTERPOLATION_IDENTIFIER_TOKEN + 1;
 const int QUESTION_QUESTION_TOKEN = QUESTION_PERIOD_TOKEN + 1;
 const int QUESTION_QUESTION_EQ_TOKEN = QUESTION_QUESTION_TOKEN + 1;