From 27156203d33290454ec6375612712be3f37c1c77 Mon Sep 17 00:00:00 2001
From: Ulya Trofimovich <skvadrik@gmail.com>
Date: Mon, 5 Aug 2019 23:33:10 +0100
Subject: [PATCH] Allow to reset 're2c:eof' configuration.

The ability to reset this configuration is necessary in order to be able to
mix re2c blocks that use EOF rule and blocks that don't.

This fixes bug #254: "Turn off re2c:eof".
---
 bootstrap/doc/re2c.1                          |   8 +-
 bootstrap/src/parse/lex_conf.cc               | 407 +++++++++---------
 doc/manual/configurations/configurations.rst_ |   6 +
 src/parse/lex_conf.re                         |   5 +-
 test/eof/eof_07.c                             |   2 +-
 test/eof/eof_09.i.c                           |  88 ++++
 test/eof/eof_09.i.re                          |  29 ++
 7 files changed, 334 insertions(+), 211 deletions(-)
 create mode 100644 test/eof/eof_09.i.c
 create mode 100644 test/eof/eof_09.i.re

diff --git a/bootstrap/doc/re2c.1 b/bootstrap/doc/re2c.1
index a3e27bd0..9c60fe21 100644
--- a/bootstrap/doc/re2c.1
+++ b/bootstrap/doc/re2c.1
@@ -834,6 +834,12 @@ Replaces \fBYYSTAGN\fP identifier with the specified string.
 .B \fBre2c:define:YYSTAGP = \(aqYYSTAGP\(aq;\fP
 Replaces \fBYYSTAGP\fP identifier with the specified string.
 .TP
+.B \fBre2c:eof = \-1;\fP
+Specifies the sentinel symbol used with EOF rule \fB$\fP to check for the end
+of input in the generated lexer. Default value is \fB\-1\fP (EOF rule is not
+used). Other possible values include all valid code points. Only decimal
+numbers are recognized.
+.TP
 .B \fBre2c:flags:8\fP or \fBre2c:flags:utf\-8\fP
 Same as \fB\-8 \-\-utf\-8\fP command\-line option.
 .TP
@@ -2363,6 +2369,6 @@ Since then it has been developed and maintained by mutiple volunteers;
 mots notably, Brain Young, Marcus Boerger, Dan Nuffer and Ulya Trofimovich.
 .SH VERSION INFORMATION
 .sp
-This manpage describes re2c version 1.1.1, package date 02 Aug 2019.
+This manpage describes re2c version 1.2, package date 05 Aug 2019.
 .\" Generated by docutils manpage writer.
 .
diff --git a/bootstrap/src/parse/lex_conf.cc b/bootstrap/src/parse/lex_conf.cc
index 76d180af..275fdb57 100644
--- a/bootstrap/src/parse/lex_conf.cc
+++ b/bootstrap/src/parse/lex_conf.cc
@@ -1,4 +1,4 @@
-/* Generated by re2c 1.1.1 on Fri Aug  2 10:49:53 2019 */
+/* Generated by re2c 1.1.1 on Mon Aug  5 23:14:16 2019 */
 #line 1 "../src/parse/lex_conf.re"
 #include "src/util/c99_stdint.h"
 #include <string>
@@ -107,7 +107,7 @@ void Scanner::lex_conf(Opt &opts)
 		}
 	}
 yy2:
-#line 176 "../src/parse/lex_conf.re"
+#line 173 "../src/parse/lex_conf.re"
 	{
         msg.fatal(tok_loc(), "unrecognized configuration '%.*s'",
             static_cast<int>(cur - tok), tok);
@@ -233,13 +233,10 @@ yy29:
 #line 74 "../src/parse/lex_conf.re"
 	{
         const int32_t eof = lex_conf_number();
-        if (eof < 0) {
-            msg.fatal(cur_loc(), "EOF symbol cannot have negative value");
-        }
-        opts.set_eof(static_cast<uint32_t>(eof));
+        opts.set_eof(eof < 0 ? NOEOF : static_cast<uint32_t>(eof));
         return;
     }
-#line 243 "src/parse/lex_conf.cc"
+#line 240 "src/parse/lex_conf.cc"
 yy31:
 	yych = (unsigned char)*++cur;
 	if (yych == 'g') goto yy43;
@@ -525,7 +522,7 @@ yy93:
 	}
 #line 68 "../src/parse/lex_conf.re"
 	{ lex_conf_enc(Enc::UTF8, opts);   return; }
-#line 529 "src/parse/lex_conf.cc"
+#line 526 "src/parse/lex_conf.cc"
 yy95:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
@@ -538,7 +535,7 @@ yy95:
         opts.set_posix_semantics(b);
         return;
     }
-#line 542 "src/parse/lex_conf.cc"
+#line 539 "src/parse/lex_conf.cc"
 yy97:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
@@ -546,7 +543,7 @@ yy97:
 	}
 #line 51 "../src/parse/lex_conf.re"
 	{ opts.set_tags             (lex_conf_bool());   return; }
-#line 550 "src/parse/lex_conf.cc"
+#line 547 "src/parse/lex_conf.cc"
 yy99:
 	yych = (unsigned char)*++cur;
 	if (yych <= 'Z') {
@@ -567,7 +564,7 @@ yy99:
 yy100:
 #line 46 "../src/parse/lex_conf.re"
 	{ opts.set_bFlag            (lex_conf_bool());   return; }
-#line 571 "src/parse/lex_conf.cc"
+#line 568 "src/parse/lex_conf.cc"
 yy101:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy144;
@@ -593,7 +590,7 @@ yy102:
 yy103:
 #line 47 "../src/parse/lex_conf.re"
 	{ opts.set_dFlag            (lex_conf_bool());   return; }
-#line 597 "src/parse/lex_conf.cc"
+#line 594 "src/parse/lex_conf.cc"
 yy104:
 	yych = (unsigned char)*++cur;
 	if (yych <= '_') {
@@ -619,7 +616,7 @@ yy104:
 yy105:
 #line 64 "../src/parse/lex_conf.re"
 	{ lex_conf_enc(Enc::EBCDIC, opts); return; }
-#line 623 "src/parse/lex_conf.cc"
+#line 620 "src/parse/lex_conf.cc"
 yy106:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
@@ -627,7 +624,7 @@ yy106:
 	}
 #line 48 "../src/parse/lex_conf.re"
 	{ opts.set_gFlag            (lex_conf_bool());   return; }
-#line 631 "src/parse/lex_conf.cc"
+#line 628 "src/parse/lex_conf.cc"
 yy108:
 	yych = (unsigned char)*++cur;
 	if (yych <= 'Z') {
@@ -648,7 +645,7 @@ yy108:
 yy109:
 #line 49 "../src/parse/lex_conf.re"
 	{ opts.set_iFlag            (lex_conf_bool());   return; }
-#line 652 "src/parse/lex_conf.cc"
+#line 649 "src/parse/lex_conf.cc"
 yy110:
 	yych = (unsigned char)*++cur;
 	if (yych == 'e') goto yy151;
@@ -674,7 +671,7 @@ yy111:
 yy112:
 #line 54 "../src/parse/lex_conf.re"
 	{ opts.set_output_file      (lex_conf_string()); return; }
-#line 678 "src/parse/lex_conf.cc"
+#line 675 "src/parse/lex_conf.cc"
 yy113:
 	yych = (unsigned char)*++cur;
 	if (yych == 'o') goto yy154;
@@ -686,7 +683,7 @@ yy114:
 	}
 #line 50 "../src/parse/lex_conf.re"
 	{ opts.set_sFlag            (lex_conf_bool());   return; }
-#line 690 "src/parse/lex_conf.cc"
+#line 687 "src/parse/lex_conf.cc"
 yy116:
 	yych = (unsigned char)*++cur;
 	if (yych <= '^') {
@@ -709,7 +706,7 @@ yy116:
 yy117:
 #line 55 "../src/parse/lex_conf.re"
 	{ opts.set_header_file      (lex_conf_string()); return; }
-#line 713 "src/parse/lex_conf.cc"
+#line 710 "src/parse/lex_conf.cc"
 yy118:
 	yych = (unsigned char)*++cur;
 	if (yych <= '^') {
@@ -733,7 +730,7 @@ yy118:
 yy119:
 #line 65 "../src/parse/lex_conf.re"
 	{ lex_conf_enc(Enc::UTF32, opts);  return; }
-#line 737 "src/parse/lex_conf.cc"
+#line 734 "src/parse/lex_conf.cc"
 yy120:
 	yych = (unsigned char)*++cur;
 	if (yych <= 'Z') {
@@ -754,7 +751,7 @@ yy120:
 yy121:
 #line 66 "../src/parse/lex_conf.re"
 	{ lex_conf_enc(Enc::UCS2, opts);   return; }
-#line 758 "src/parse/lex_conf.cc"
+#line 755 "src/parse/lex_conf.cc"
 yy122:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
@@ -762,7 +759,7 @@ yy122:
 	}
 #line 67 "../src/parse/lex_conf.re"
 	{ lex_conf_enc(Enc::UTF16, opts);  return; }
-#line 766 "src/parse/lex_conf.cc"
+#line 763 "src/parse/lex_conf.cc"
 yy124:
 	yych = (unsigned char)*++cur;
 	if (yych <= 'r') goto yy4;
@@ -961,9 +958,9 @@ yy170:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 111 "../src/parse/lex_conf.re"
+#line 108 "../src/parse/lex_conf.re"
 	{ opts.set_yybmHexTable (lex_conf_bool()); return; }
-#line 967 "src/parse/lex_conf.cc"
+#line 964 "src/parse/lex_conf.cc"
 yy172:
 	yych = (unsigned char)*++cur;
 	if (yych == 'v') goto yy212;
@@ -1000,9 +997,9 @@ yy179:
 	}
 	if (yych == '@') goto yy220;
 yy180:
-#line 95 "../src/parse/lex_conf.re"
+#line 92 "../src/parse/lex_conf.re"
 	{ opts.set_condGoto         (lex_conf_string ()); return; }
-#line 1006 "src/parse/lex_conf.cc"
+#line 1003 "src/parse/lex_conf.cc"
 yy181:
 	yych = (unsigned char)*++cur;
 	if (yych == 'r') goto yy222;
@@ -1149,9 +1146,9 @@ yy213:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 158 "../src/parse/lex_conf.re"
+#line 155 "../src/parse/lex_conf.re"
 	{ opts.set_bEmitYYCh      (lex_conf_bool()); return; }
-#line 1155 "src/parse/lex_conf.cc"
+#line 1152 "src/parse/lex_conf.cc"
 yy215:
 	yych = (unsigned char)*++cur;
 	if (yych == 'e') goto yy264;
@@ -1207,9 +1204,9 @@ yy223:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 91 "../src/parse/lex_conf.re"
+#line 88 "../src/parse/lex_conf.re"
 	{ opts.set_condPrefix       (lex_conf_string ()); return; }
-#line 1213 "src/parse/lex_conf.cc"
+#line 1210 "src/parse/lex_conf.cc"
 yy225:
 	yych = (unsigned char)*++cur;
 	if (yych == 'A') goto yy271;
@@ -1334,7 +1331,7 @@ yy251:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 144 "../src/parse/lex_conf.re"
+#line 141 "../src/parse/lex_conf.re"
 	{
         const int32_t n = lex_conf_number ();
         if (n < 0) {
@@ -1343,7 +1340,7 @@ yy251:
         opts.set_topIndent (static_cast<uint32_t> (n));
         return;
     }
-#line 1347 "src/parse/lex_conf.cc"
+#line 1344 "src/parse/lex_conf.cc"
 yy253:
 	yych = (unsigned char)*++cur;
 	if (yych == 'l') goto yy304;
@@ -1378,9 +1375,9 @@ yy256:
 		}
 	}
 yy257:
-#line 171 "../src/parse/lex_conf.re"
+#line 168 "../src/parse/lex_conf.re"
 	{ opts.set_startlabel       (lex_conf_string()); return; }
-#line 1384 "src/parse/lex_conf.cc"
+#line 1381 "src/parse/lex_conf.cc"
 yy258:
 	yych = (unsigned char)*++cur;
 	if (yych == 't') goto yy312;
@@ -1530,7 +1527,7 @@ yy293:
 	}
 #line 71 "../src/parse/lex_conf.re"
 	{ lex_conf_input(opts);            return; }
-#line 1534 "src/parse/lex_conf.cc"
+#line 1531 "src/parse/lex_conf.cc"
 yy295:
 	yych = (unsigned char)*++cur;
 	if (yych == 'd') goto yy351;
@@ -1580,9 +1577,9 @@ yy306:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 167 "../src/parse/lex_conf.re"
+#line 164 "../src/parse/lex_conf.re"
 	{ opts.set_labelPrefix (lex_conf_string ()); return; }
-#line 1586 "src/parse/lex_conf.cc"
+#line 1583 "src/parse/lex_conf.cc"
 yy308:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -1618,9 +1615,9 @@ yy312:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 106 "../src/parse/lex_conf.re"
+#line 103 "../src/parse/lex_conf.re"
 	{ opts.set_bUseStateAbort  (lex_conf_bool()); return; }
-#line 1624 "src/parse/lex_conf.cc"
+#line 1621 "src/parse/lex_conf.cc"
 yy314:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy367;
@@ -1634,9 +1631,9 @@ yy316:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 140 "../src/parse/lex_conf.re"
+#line 137 "../src/parse/lex_conf.re"
 	{ opts.set_tags_prefix    (lex_conf_string ()); return; }
-#line 1640 "src/parse/lex_conf.cc"
+#line 1637 "src/parse/lex_conf.cc"
 yy318:
 	yych = (unsigned char)*++cur;
 	if (yych <= 'c') {
@@ -1678,9 +1675,9 @@ yy324:
 	}
 	if (yych == '@') goto yy380;
 yy325:
-#line 93 "../src/parse/lex_conf.re"
+#line 90 "../src/parse/lex_conf.re"
 	{ opts.set_condDivider      (lex_conf_string ()); return; }
-#line 1684 "src/parse/lex_conf.cc"
+#line 1681 "src/parse/lex_conf.cc"
 yy326:
 	yych = (unsigned char)*++cur;
 	if (yych == 'n') goto yy381;
@@ -1826,9 +1823,9 @@ yy360:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 105 "../src/parse/lex_conf.re"
+#line 102 "../src/parse/lex_conf.re"
 	{ opts.set_yynext          (lex_conf_string ()); return; }
-#line 1832 "src/parse/lex_conf.cc"
+#line 1829 "src/parse/lex_conf.cc"
 yy362:
 	yych = (unsigned char)*++cur;
 	if (yych <= '0') goto yy221;
@@ -1838,9 +1835,9 @@ yy363:
 	++cur;
 yy364:
 	cur = ctx;
-#line 170 "../src/parse/lex_conf.re"
+#line 167 "../src/parse/lex_conf.re"
 	{ opts.set_startlabel_force (lex_conf_bool());   return; }
-#line 1844 "src/parse/lex_conf.cc"
+#line 1841 "src/parse/lex_conf.cc"
 yy365:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -1887,9 +1884,9 @@ yy375:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 165 "../src/parse/lex_conf.re"
+#line 162 "../src/parse/lex_conf.re"
 	{ opts.set_fill_check   (lex_conf_bool()); return; }
-#line 1893 "src/parse/lex_conf.cc"
+#line 1890 "src/parse/lex_conf.cc"
 yy377:
 	yych = (unsigned char)*++cur;
 	if (yych == 'e') goto yy431;
@@ -1958,9 +1955,9 @@ yy389:
 		}
 	}
 yy390:
-#line 160 "../src/parse/lex_conf.re"
+#line 157 "../src/parse/lex_conf.re"
 	{ opts.set_fill         (lex_conf_string ()); return; }
-#line 1964 "src/parse/lex_conf.cc"
+#line 1961 "src/parse/lex_conf.cc"
 yy391:
 	yych = (unsigned char)*++cur;
 	if (yych == 'O') goto yy450;
@@ -1991,9 +1988,9 @@ yy397:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 127 "../src/parse/lex_conf.re"
+#line 124 "../src/parse/lex_conf.re"
 	{ opts.set_yypeek       (lex_conf_string ()); return; }
-#line 1997 "src/parse/lex_conf.cc"
+#line 1994 "src/parse/lex_conf.cc"
 yy399:
 	yych = (unsigned char)*++cur;
 	if (yych == 'O') goto yy460;
@@ -2011,9 +2008,9 @@ yy402:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 128 "../src/parse/lex_conf.re"
+#line 125 "../src/parse/lex_conf.re"
 	{ opts.set_yyskip       (lex_conf_string ()); return; }
-#line 2017 "src/parse/lex_conf.cc"
+#line 2014 "src/parse/lex_conf.cc"
 yy404:
 	yych = (unsigned char)*++cur;
 	if (yych == 'N') goto yy463;
@@ -2075,9 +2072,9 @@ yy417:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 143 "../src/parse/lex_conf.re"
+#line 140 "../src/parse/lex_conf.re"
 	{ opts.set_indString (lex_conf_string ()); return; }
-#line 2081 "src/parse/lex_conf.cc"
+#line 2078 "src/parse/lex_conf.cc"
 yy419:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy479;
@@ -2099,17 +2096,17 @@ yy423:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 110 "../src/parse/lex_conf.re"
+#line 107 "../src/parse/lex_conf.re"
 	{ opts.set_yybm         (lex_conf_string ()); return; }
-#line 2105 "src/parse/lex_conf.cc"
+#line 2102 "src/parse/lex_conf.cc"
 yy425:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 156 "../src/parse/lex_conf.re"
+#line 153 "../src/parse/lex_conf.re"
 	{ opts.set_yych           (lex_conf_string ()); return; }
-#line 2113 "src/parse/lex_conf.cc"
+#line 2110 "src/parse/lex_conf.cc"
 yy427:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy483;
@@ -2131,9 +2128,9 @@ yy431:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 161 "../src/parse/lex_conf.re"
+#line 158 "../src/parse/lex_conf.re"
 	{ opts.set_fill_use     (lex_conf_bool()); return; }
-#line 2137 "src/parse/lex_conf.cc"
+#line 2134 "src/parse/lex_conf.cc"
 yy433:
 	yych = (unsigned char)*++cur;
 	if (yych == 't') goto yy487;
@@ -2148,17 +2145,17 @@ yy435:
 	goto yy221;
 yy436:
 	++cur;
-#line 96 "../src/parse/lex_conf.re"
+#line 93 "../src/parse/lex_conf.re"
 	{ opts.set_condGotoParam    (lex_conf_string ()); return; }
-#line 2154 "src/parse/lex_conf.cc"
+#line 2151 "src/parse/lex_conf.cc"
 yy438:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 92 "../src/parse/lex_conf.re"
+#line 89 "../src/parse/lex_conf.re"
 	{ opts.set_condEnumPrefix   (lex_conf_string ()); return; }
-#line 2162 "src/parse/lex_conf.cc"
+#line 2159 "src/parse/lex_conf.cc"
 yy440:
 	yych = (unsigned char)*++cur;
 	if (yych == 'P') goto yy491;
@@ -2176,9 +2173,9 @@ yy443:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 155 "../src/parse/lex_conf.re"
+#line 152 "../src/parse/lex_conf.re"
 	{ opts.set_yyctype        (lex_conf_string ()); return; }
-#line 2182 "src/parse/lex_conf.cc"
+#line 2179 "src/parse/lex_conf.cc"
 yy445:
 	yych = (unsigned char)*++cur;
 	if (yych == 'R') goto yy495;
@@ -2188,9 +2185,9 @@ yy446:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 153 "../src/parse/lex_conf.re"
+#line 150 "../src/parse/lex_conf.re"
 	{ opts.set_yydebug (lex_conf_string ()); return; }
-#line 2194 "src/parse/lex_conf.cc"
+#line 2191 "src/parse/lex_conf.cc"
 yy448:
 	yych = (unsigned char)*++cur;
 	if (yych == 'n') goto yy497;
@@ -2216,9 +2213,9 @@ yy453:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 125 "../src/parse/lex_conf.re"
+#line 122 "../src/parse/lex_conf.re"
 	{ opts.set_yylimit     (lex_conf_string ()); return; }
-#line 2222 "src/parse/lex_conf.cc"
+#line 2219 "src/parse/lex_conf.cc"
 yy455:
 	yych = (unsigned char)*++cur;
 	if (yych == 'R') goto yy502;
@@ -2228,17 +2225,17 @@ yy456:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 137 "../src/parse/lex_conf.re"
+#line 134 "../src/parse/lex_conf.re"
 	{ opts.set_yymtagn      (lex_conf_string ()); return; }
-#line 2234 "src/parse/lex_conf.cc"
+#line 2231 "src/parse/lex_conf.cc"
 yy458:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 138 "../src/parse/lex_conf.re"
+#line 135 "../src/parse/lex_conf.re"
 	{ opts.set_yymtagp      (lex_conf_string ()); return; }
-#line 2242 "src/parse/lex_conf.cc"
+#line 2239 "src/parse/lex_conf.cc"
 yy460:
 	yych = (unsigned char)*++cur;
 	if (yych == 'R') goto yy504;
@@ -2256,17 +2253,17 @@ yy463:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 135 "../src/parse/lex_conf.re"
+#line 132 "../src/parse/lex_conf.re"
 	{ opts.set_yystagn      (lex_conf_string ()); return; }
-#line 2262 "src/parse/lex_conf.cc"
+#line 2259 "src/parse/lex_conf.cc"
 yy465:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 136 "../src/parse/lex_conf.re"
+#line 133 "../src/parse/lex_conf.re"
 	{ opts.set_yystagp      (lex_conf_string ()); return; }
-#line 2270 "src/parse/lex_conf.cc"
+#line 2267 "src/parse/lex_conf.cc"
 yy467:
 	yych = (unsigned char)*++cur;
 	if (yych == 'o') goto yy507;
@@ -2356,7 +2353,7 @@ yy488:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 112 "../src/parse/lex_conf.re"
+#line 109 "../src/parse/lex_conf.re"
 	{
         const int32_t n = lex_conf_number ();
         if (n < 0) {
@@ -2365,7 +2362,7 @@ yy488:
         opts.set_cGotoThreshold (static_cast<uint32_t> (n));
         return;
     }
-#line 2369 "src/parse/lex_conf.cc"
+#line 2366 "src/parse/lex_conf.cc"
 yy490:
 	yych = (unsigned char)*++cur;
 	if (yych == 'n') goto yy531;
@@ -2389,9 +2386,9 @@ yy491:
 		}
 	}
 yy492:
-#line 129 "../src/parse/lex_conf.re"
+#line 126 "../src/parse/lex_conf.re"
 	{ opts.set_yybackup     (lex_conf_string ()); return; }
-#line 2395 "src/parse/lex_conf.cc"
+#line 2392 "src/parse/lex_conf.cc"
 yy493:
 	yych = (unsigned char)*++cur;
 	if (yych == 'P') goto yy533;
@@ -2405,9 +2402,9 @@ yy495:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 122 "../src/parse/lex_conf.re"
+#line 119 "../src/parse/lex_conf.re"
 	{ opts.set_yycursor    (lex_conf_string ()); return; }
-#line 2411 "src/parse/lex_conf.cc"
+#line 2408 "src/parse/lex_conf.cc"
 yy497:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy535;
@@ -2433,9 +2430,9 @@ yy502:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 123 "../src/parse/lex_conf.re"
+#line 120 "../src/parse/lex_conf.re"
 	{ opts.set_yymarker    (lex_conf_string ()); return; }
-#line 2439 "src/parse/lex_conf.cc"
+#line 2436 "src/parse/lex_conf.cc"
 yy504:
 	yych = (unsigned char)*++cur;
 	if (yych == 'E') goto yy540;
@@ -2505,17 +2502,17 @@ yy520:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 107 "../src/parse/lex_conf.re"
+#line 104 "../src/parse/lex_conf.re"
 	{ opts.set_bUseStateNext   (lex_conf_bool()); return; }
-#line 2511 "src/parse/lex_conf.cc"
+#line 2508 "src/parse/lex_conf.cc"
 yy522:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 141 "../src/parse/lex_conf.re"
+#line 138 "../src/parse/lex_conf.re"
 	{ opts.set_tags_expression(lex_conf_string ()); return; }
-#line 2519 "src/parse/lex_conf.cc"
+#line 2516 "src/parse/lex_conf.cc"
 yy524:
 	yych = (unsigned char)*++cur;
 	if (yych == 'p') goto yy556;
@@ -2537,9 +2534,9 @@ yy528:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 157 "../src/parse/lex_conf.re"
+#line 154 "../src/parse/lex_conf.re"
 	{ opts.set_yychConversion (lex_conf_bool()); return; }
-#line 2543 "src/parse/lex_conf.cc"
+#line 2540 "src/parse/lex_conf.cc"
 yy530:
 	yych = (unsigned char)*++cur;
 	if (yych == 'r') goto yy560;
@@ -2601,9 +2598,9 @@ yy540:
 		}
 	}
 yy541:
-#line 131 "../src/parse/lex_conf.re"
+#line 128 "../src/parse/lex_conf.re"
 	{ opts.set_yyrestore    (lex_conf_string ()); return; }
-#line 2607 "src/parse/lex_conf.cc"
+#line 2604 "src/parse/lex_conf.cc"
 yy542:
 	yych = (unsigned char)*++cur;
 	if (yych == 'I') goto yy578;
@@ -2683,14 +2680,14 @@ yy560:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 163 "../src/parse/lex_conf.re"
+#line 160 "../src/parse/lex_conf.re"
 	{ opts.set_fill_arg_use (lex_conf_bool()); return; }
-#line 2689 "src/parse/lex_conf.cc"
+#line 2686 "src/parse/lex_conf.cc"
 yy562:
 	++cur;
-#line 94 "../src/parse/lex_conf.re"
+#line 91 "../src/parse/lex_conf.re"
 	{ opts.set_condDividerParam (lex_conf_string ()); return; }
-#line 2694 "src/parse/lex_conf.cc"
+#line 2691 "src/parse/lex_conf.cc"
 yy564:
 	yych = (unsigned char)*++cur;
 	if (yych == 'X') goto yy602;
@@ -2700,9 +2697,9 @@ yy565:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 85 "../src/parse/lex_conf.re"
+#line 82 "../src/parse/lex_conf.re"
 	{ opts.set_yycondtype       (lex_conf_string ()); return; }
-#line 2706 "src/parse/lex_conf.cc"
+#line 2703 "src/parse/lex_conf.cc"
 yy567:
 	yych = (unsigned char)*++cur;
 	if (yych == 'R') goto yy604;
@@ -2713,9 +2710,9 @@ yy568:
 	goto yy4;
 yy569:
 	++cur;
-#line 162 "../src/parse/lex_conf.re"
+#line 159 "../src/parse/lex_conf.re"
 	{ opts.set_fill_arg     (lex_conf_string ()); return; }
-#line 2719 "src/parse/lex_conf.cc"
+#line 2716 "src/parse/lex_conf.cc"
 yy571:
 	yych = (unsigned char)*++cur;
 	if (yych == 'T') goto yy607;
@@ -2739,17 +2736,17 @@ yy572:
 		}
 	}
 yy573:
-#line 99 "../src/parse/lex_conf.re"
+#line 96 "../src/parse/lex_conf.re"
 	{ opts.set_state_get       (lex_conf_string ()); return; }
-#line 2745 "src/parse/lex_conf.cc"
+#line 2742 "src/parse/lex_conf.cc"
 yy574:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 134 "../src/parse/lex_conf.re"
+#line 131 "../src/parse/lex_conf.re"
 	{ opts.set_yylessthan   (lex_conf_string ()); return; }
-#line 2753 "src/parse/lex_conf.cc"
+#line 2750 "src/parse/lex_conf.cc"
 yy576:
 	yych = (unsigned char)*++cur;
 	if (yych == 'T') goto yy609;
@@ -2782,9 +2779,9 @@ yy579:
 		}
 	}
 yy580:
-#line 101 "../src/parse/lex_conf.re"
+#line 98 "../src/parse/lex_conf.re"
 	{ opts.set_state_set       (lex_conf_string ()); return; }
-#line 2788 "src/parse/lex_conf.cc"
+#line 2785 "src/parse/lex_conf.cc"
 yy581:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
@@ -2814,7 +2811,7 @@ yy586:
 	}
 #line 72 "../src/parse/lex_conf.re"
 	{ lex_conf_empty_class(opts);      return; }
-#line 2818 "src/parse/lex_conf.cc"
+#line 2815 "src/parse/lex_conf.cc"
 yy588:
 	yych = (unsigned char)*++cur;
 	if (yych == 'l') goto yy618;
@@ -2838,57 +2835,57 @@ yy592:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 104 "../src/parse/lex_conf.re"
+#line 101 "../src/parse/lex_conf.re"
 	{ opts.set_yyfilllabel     (lex_conf_string ()); return; }
-#line 2844 "src/parse/lex_conf.cc"
+#line 2841 "src/parse/lex_conf.cc"
 yy594:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 108 "../src/parse/lex_conf.re"
+#line 105 "../src/parse/lex_conf.re"
 	{ opts.set_yyaccept        (lex_conf_string ()); return; }
-#line 2852 "src/parse/lex_conf.cc"
+#line 2849 "src/parse/lex_conf.cc"
 yy596:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 97 "../src/parse/lex_conf.re"
+#line 94 "../src/parse/lex_conf.re"
 	{ opts.set_yyctable         (lex_conf_string ()); return; }
-#line 2860 "src/parse/lex_conf.cc"
+#line 2857 "src/parse/lex_conf.cc"
 yy598:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 174 "../src/parse/lex_conf.re"
+#line 171 "../src/parse/lex_conf.re"
 	{ lex_conf_string (); return; }
-#line 2868 "src/parse/lex_conf.cc"
+#line 2865 "src/parse/lex_conf.cc"
 yy600:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 120 "../src/parse/lex_conf.re"
+#line 117 "../src/parse/lex_conf.re"
 	{ opts.set_yytarget (lex_conf_string ()); return; }
-#line 2876 "src/parse/lex_conf.cc"
+#line 2873 "src/parse/lex_conf.cc"
 yy602:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 130 "../src/parse/lex_conf.re"
+#line 127 "../src/parse/lex_conf.re"
 	{ opts.set_yybackupctx  (lex_conf_string ()); return; }
-#line 2884 "src/parse/lex_conf.cc"
+#line 2881 "src/parse/lex_conf.cc"
 yy604:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 124 "../src/parse/lex_conf.re"
+#line 121 "../src/parse/lex_conf.re"
 	{ opts.set_yyctxmarker (lex_conf_string ()); return; }
-#line 2892 "src/parse/lex_conf.cc"
+#line 2889 "src/parse/lex_conf.cc"
 yy606:
 	yych = (unsigned char)*++cur;
 	if (yych == 'd') goto yy621;
@@ -2956,9 +2953,9 @@ yy621:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 164 "../src/parse/lex_conf.re"
+#line 161 "../src/parse/lex_conf.re"
 	{ opts.set_fill_naked   (lex_conf_bool()); return; }
-#line 2962 "src/parse/lex_conf.cc"
+#line 2959 "src/parse/lex_conf.cc"
 yy623:
 	yych = (unsigned char)*++cur;
 	if (yych == 'O') goto yy639;
@@ -2972,17 +2969,17 @@ yy625:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 132 "../src/parse/lex_conf.re"
+#line 129 "../src/parse/lex_conf.re"
 	{ opts.set_yyrestorectx (lex_conf_string ()); return; }
-#line 2978 "src/parse/lex_conf.cc"
+#line 2975 "src/parse/lex_conf.cc"
 yy627:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 133 "../src/parse/lex_conf.re"
+#line 130 "../src/parse/lex_conf.re"
 	{ opts.set_yyrestoretag (lex_conf_string ()); return; }
-#line 2986 "src/parse/lex_conf.cc"
+#line 2983 "src/parse/lex_conf.cc"
 yy629:
 	yych = (unsigned char)*++cur;
 	if (yych == 'O') goto yy641;
@@ -3006,7 +3003,7 @@ yy633:
 	}
 #line 53 "../src/parse/lex_conf.re"
 	{ opts.set_bCaseInverted    (lex_conf_bool());   return; }
-#line 3010 "src/parse/lex_conf.cc"
+#line 3007 "src/parse/lex_conf.cc"
 yy635:
 	yych = (unsigned char)*++cur;
 	if (yych == 's') goto yy106;
@@ -3072,9 +3069,9 @@ yy646:
 		}
 	}
 yy647:
-#line 86 "../src/parse/lex_conf.re"
+#line 83 "../src/parse/lex_conf.re"
 	{ opts.set_cond_get         (lex_conf_string ()); return; }
-#line 3078 "src/parse/lex_conf.cc"
+#line 3075 "src/parse/lex_conf.cc"
 yy648:
 	yych = (unsigned char)*++cur;
 	if (yych == 'e') goto yy657;
@@ -3099,9 +3096,9 @@ yy649:
 		}
 	}
 yy650:
-#line 88 "../src/parse/lex_conf.re"
+#line 85 "../src/parse/lex_conf.re"
 	{ opts.set_cond_set         (lex_conf_string ()); return; }
-#line 3105 "src/parse/lex_conf.cc"
+#line 3102 "src/parse/lex_conf.cc"
 yy651:
 	yych = (unsigned char)*++cur;
 	if (yych == 'e') goto yy660;
@@ -3121,7 +3118,7 @@ yy654:
 	}
 #line 70 "../src/parse/lex_conf.re"
 	{ lex_conf_encoding_policy(opts);  return; }
-#line 3125 "src/parse/lex_conf.cc"
+#line 3122 "src/parse/lex_conf.cc"
 yy656:
 	yych = (unsigned char)*++cur;
 	if (yych == 'n') goto yy664;
@@ -3153,7 +3150,7 @@ yy662:
 	}
 #line 52 "../src/parse/lex_conf.re"
 	{ opts.set_bCaseInsensitive (lex_conf_bool());   return; }
-#line 3157 "src/parse/lex_conf.cc"
+#line 3154 "src/parse/lex_conf.cc"
 yy664:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy673;
@@ -3163,9 +3160,9 @@ yy665:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 100 "../src/parse/lex_conf.re"
+#line 97 "../src/parse/lex_conf.re"
 	{ opts.set_state_get_naked (lex_conf_bool()); return; }
-#line 3169 "src/parse/lex_conf.cc"
+#line 3166 "src/parse/lex_conf.cc"
 yy667:
 	yych = (unsigned char)*++cur;
 	if (yych == 'a') goto yy674;
@@ -3179,14 +3176,14 @@ yy669:
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 102 "../src/parse/lex_conf.re"
+#line 99 "../src/parse/lex_conf.re"
 	{ opts.set_state_set_naked (lex_conf_bool()); return; }
-#line 3185 "src/parse/lex_conf.cc"
+#line 3182 "src/parse/lex_conf.cc"
 yy671:
 	++cur;
-#line 103 "../src/parse/lex_conf.re"
+#line 100 "../src/parse/lex_conf.re"
 	{ opts.set_state_set_arg   (lex_conf_string ()); return; }
-#line 3190 "src/parse/lex_conf.cc"
+#line 3187 "src/parse/lex_conf.cc"
 yy673:
 	yych = (unsigned char)*++cur;
 	if (yych == 'k') goto yy676;
@@ -3221,27 +3218,27 @@ yy680:
 	goto yy4;
 yy681:
 	++cur;
-#line 89 "../src/parse/lex_conf.re"
+#line 86 "../src/parse/lex_conf.re"
 	{ opts.set_cond_set_arg     (lex_conf_string ()); return; }
-#line 3227 "src/parse/lex_conf.cc"
+#line 3224 "src/parse/lex_conf.cc"
 yy683:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 87 "../src/parse/lex_conf.re"
+#line 84 "../src/parse/lex_conf.re"
 	{ opts.set_cond_get_naked   (lex_conf_bool()); return; }
-#line 3235 "src/parse/lex_conf.cc"
+#line 3232 "src/parse/lex_conf.cc"
 yy685:
 	yych = (unsigned char)*++cur;
 	if (yybm[0+yych] & 32) {
 		goto yy3;
 	}
-#line 90 "../src/parse/lex_conf.re"
+#line 87 "../src/parse/lex_conf.re"
 	{ opts.set_cond_set_naked   (lex_conf_bool()); return; }
-#line 3243 "src/parse/lex_conf.cc"
+#line 3240 "src/parse/lex_conf.cc"
 }
-#line 180 "../src/parse/lex_conf.re"
+#line 177 "../src/parse/lex_conf.re"
 
 }
 
@@ -3249,7 +3246,7 @@ void Scanner::lex_conf_encoding_policy(Opt &opts)
 {
     lex_conf_assign ();
 
-#line 3253 "src/parse/lex_conf.cc"
+#line 3250 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	if ((lim - cur) < 10) YYFILL(10);
@@ -3262,10 +3259,10 @@ void Scanner::lex_conf_encoding_policy(Opt &opts)
 	}
 	++cur;
 yy690:
-#line 187 "../src/parse/lex_conf.re"
+#line 184 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(),
         "bad configuration value (expected: 'ignore', 'substitute', 'fail')"); }
-#line 3269 "src/parse/lex_conf.cc"
+#line 3266 "src/parse/lex_conf.cc"
 yy691:
 	yych = (unsigned char)*(mar = ++cur);
 	if (yych == 'a') goto yy694;
@@ -3306,9 +3303,9 @@ yy700:
 	goto yy695;
 yy701:
 	++cur;
-#line 191 "../src/parse/lex_conf.re"
+#line 188 "../src/parse/lex_conf.re"
 	{ opts.set_encoding_policy(Enc::POLICY_FAIL);       goto end; }
-#line 3312 "src/parse/lex_conf.cc"
+#line 3309 "src/parse/lex_conf.cc"
 yy703:
 	yych = (unsigned char)*++cur;
 	if (yych == 'r') goto yy705;
@@ -3327,9 +3324,9 @@ yy706:
 	goto yy695;
 yy707:
 	++cur;
-#line 189 "../src/parse/lex_conf.re"
+#line 186 "../src/parse/lex_conf.re"
 	{ opts.set_encoding_policy(Enc::POLICY_IGNORE);     goto end; }
-#line 3333 "src/parse/lex_conf.cc"
+#line 3330 "src/parse/lex_conf.cc"
 yy709:
 	yych = (unsigned char)*++cur;
 	if (yych != 't') goto yy695;
@@ -3340,11 +3337,11 @@ yy709:
 	yych = (unsigned char)*++cur;
 	if (yych != 'e') goto yy695;
 	++cur;
-#line 190 "../src/parse/lex_conf.re"
+#line 187 "../src/parse/lex_conf.re"
 	{ opts.set_encoding_policy(Enc::POLICY_SUBSTITUTE); goto end; }
-#line 3346 "src/parse/lex_conf.cc"
+#line 3343 "src/parse/lex_conf.cc"
 }
-#line 192 "../src/parse/lex_conf.re"
+#line 189 "../src/parse/lex_conf.re"
 
 end:
     lex_conf_semicolon();
@@ -3354,7 +3351,7 @@ void Scanner::lex_conf_input(Opt &opts)
 {
     lex_conf_assign ();
 
-#line 3358 "src/parse/lex_conf.cc"
+#line 3355 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	if ((lim - cur) < 7) YYFILL(7);
@@ -3365,9 +3362,9 @@ void Scanner::lex_conf_input(Opt &opts)
 yy717:
 	++cur;
 yy718:
-#line 201 "../src/parse/lex_conf.re"
+#line 198 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(), "bad configuration value (expected: 'default', 'custom')"); }
-#line 3371 "src/parse/lex_conf.cc"
+#line 3368 "src/parse/lex_conf.cc"
 yy719:
 	yych = (unsigned char)*(mar = ++cur);
 	if (yych == 'u') goto yy721;
@@ -3412,18 +3409,18 @@ yy729:
 	goto yy722;
 yy730:
 	++cur;
-#line 203 "../src/parse/lex_conf.re"
+#line 200 "../src/parse/lex_conf.re"
 	{ opts.set_input_api(INPUT_CUSTOM);  goto end; }
-#line 3418 "src/parse/lex_conf.cc"
+#line 3415 "src/parse/lex_conf.cc"
 yy732:
 	yych = (unsigned char)*++cur;
 	if (yych != 't') goto yy722;
 	++cur;
-#line 202 "../src/parse/lex_conf.re"
+#line 199 "../src/parse/lex_conf.re"
 	{ opts.set_input_api(INPUT_DEFAULT); goto end; }
-#line 3425 "src/parse/lex_conf.cc"
+#line 3422 "src/parse/lex_conf.cc"
 }
-#line 204 "../src/parse/lex_conf.re"
+#line 201 "../src/parse/lex_conf.re"
 
 end:
     lex_conf_semicolon();
@@ -3433,7 +3430,7 @@ void Scanner::lex_conf_empty_class(Opt &opts)
 {
     lex_conf_assign ();
 
-#line 3437 "src/parse/lex_conf.cc"
+#line 3434 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	if ((lim - cur) < 11) YYFILL(11);
@@ -3442,10 +3439,10 @@ void Scanner::lex_conf_empty_class(Opt &opts)
 	if (yych == 'm') goto yy740;
 	++cur;
 yy738:
-#line 213 "../src/parse/lex_conf.re"
+#line 210 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(),
         "bad configuration value (expected: 'match-empty', 'match-none', 'error')"); }
-#line 3449 "src/parse/lex_conf.cc"
+#line 3446 "src/parse/lex_conf.cc"
 yy739:
 	yych = (unsigned char)*(mar = ++cur);
 	if (yych == 'r') goto yy741;
@@ -3482,9 +3479,9 @@ yy747:
 	goto yy742;
 yy748:
 	++cur;
-#line 217 "../src/parse/lex_conf.re"
+#line 214 "../src/parse/lex_conf.re"
 	{ opts.set_empty_class_policy(EMPTY_CLASS_ERROR);       goto end; }
-#line 3488 "src/parse/lex_conf.cc"
+#line 3485 "src/parse/lex_conf.cc"
 yy750:
 	yych = (unsigned char)*++cur;
 	if (yych != '-') goto yy742;
@@ -3522,16 +3519,16 @@ yy758:
 	goto yy742;
 yy759:
 	++cur;
-#line 216 "../src/parse/lex_conf.re"
+#line 213 "../src/parse/lex_conf.re"
 	{ opts.set_empty_class_policy(EMPTY_CLASS_MATCH_NONE);  goto end; }
-#line 3528 "src/parse/lex_conf.cc"
+#line 3525 "src/parse/lex_conf.cc"
 yy761:
 	++cur;
-#line 215 "../src/parse/lex_conf.re"
+#line 212 "../src/parse/lex_conf.re"
 	{ opts.set_empty_class_policy(EMPTY_CLASS_MATCH_EMPTY); goto end; }
-#line 3533 "src/parse/lex_conf.cc"
+#line 3530 "src/parse/lex_conf.cc"
 }
-#line 218 "../src/parse/lex_conf.re"
+#line 215 "../src/parse/lex_conf.re"
 
 end:
     lex_conf_semicolon();
@@ -3549,7 +3546,7 @@ void Scanner::lex_conf_enc(Enc::type_t enc, Opt &opts)
 void Scanner::lex_conf_assign ()
 {
 
-#line 3553 "src/parse/lex_conf.cc"
+#line 3550 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	static const unsigned char yybm[] = {
@@ -3596,9 +3593,9 @@ void Scanner::lex_conf_assign ()
 	}
 	++cur;
 yy766:
-#line 235 "../src/parse/lex_conf.re"
+#line 232 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(), "missing '=' in configuration"); }
-#line 3602 "src/parse/lex_conf.cc"
+#line 3599 "src/parse/lex_conf.cc"
 yy767:
 	yych = (unsigned char)*(mar = ++cur);
 	if (yych <= 0x1F) {
@@ -3615,9 +3612,9 @@ yy768:
 	if (yybm[0+yych] & 128) {
 		goto yy768;
 	}
-#line 236 "../src/parse/lex_conf.re"
+#line 233 "../src/parse/lex_conf.re"
 	{ return; }
-#line 3621 "src/parse/lex_conf.cc"
+#line 3618 "src/parse/lex_conf.cc"
 yy771:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -3631,14 +3628,14 @@ yy771:
 	cur = mar;
 	goto yy766;
 }
-#line 237 "../src/parse/lex_conf.re"
+#line 234 "../src/parse/lex_conf.re"
 
 }
 
 void Scanner::lex_conf_semicolon ()
 {
 
-#line 3642 "src/parse/lex_conf.cc"
+#line 3639 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	static const unsigned char yybm[] = {
@@ -3685,9 +3682,9 @@ void Scanner::lex_conf_semicolon ()
 	}
 	++cur;
 yy777:
-#line 243 "../src/parse/lex_conf.re"
+#line 240 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(), "missing ending ';' in configuration"); }
-#line 3691 "src/parse/lex_conf.cc"
+#line 3688 "src/parse/lex_conf.cc"
 yy778:
 	yych = (unsigned char)*(mar = ++cur);
 	if (yybm[0+yych] & 128) {
@@ -3696,9 +3693,9 @@ yy778:
 	if (yych != ';') goto yy777;
 yy779:
 	++cur;
-#line 244 "../src/parse/lex_conf.re"
+#line 241 "../src/parse/lex_conf.re"
 	{ return; }
-#line 3702 "src/parse/lex_conf.cc"
+#line 3699 "src/parse/lex_conf.cc"
 yy781:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -3710,7 +3707,7 @@ yy781:
 	cur = mar;
 	goto yy777;
 }
-#line 245 "../src/parse/lex_conf.re"
+#line 242 "../src/parse/lex_conf.re"
 
 }
 
@@ -3724,7 +3721,7 @@ int32_t Scanner::lex_conf_number ()
     lex_conf_assign ();
     tok = cur;
 
-#line 3728 "src/parse/lex_conf.cc"
+#line 3725 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	static const unsigned char yybm[] = {
@@ -3771,9 +3768,9 @@ int32_t Scanner::lex_conf_number ()
 	}
 	++cur;
 yy787:
-#line 258 "../src/parse/lex_conf.re"
+#line 255 "../src/parse/lex_conf.re"
 	{ msg.fatal(cur_loc(), "bad configuration value (expected number)"); }
-#line 3777 "src/parse/lex_conf.cc"
+#line 3774 "src/parse/lex_conf.cc"
 yy788:
 	yych = (unsigned char)*++cur;
 	if (yych <= '0') goto yy787;
@@ -3782,7 +3779,7 @@ yy788:
 yy789:
 	++cur;
 yy790:
-#line 259 "../src/parse/lex_conf.re"
+#line 256 "../src/parse/lex_conf.re"
 	{
         int32_t n = 0;
         if (!s_to_i32_unsafe (tok, cur, n)) {
@@ -3791,7 +3788,7 @@ yy790:
         lex_conf_semicolon ();
         return n;
     }
-#line 3795 "src/parse/lex_conf.cc"
+#line 3792 "src/parse/lex_conf.cc"
 yy791:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -3801,7 +3798,7 @@ yy791:
 	}
 	goto yy790;
 }
-#line 267 "../src/parse/lex_conf.re"
+#line 264 "../src/parse/lex_conf.re"
 
 }
 
@@ -3811,7 +3808,7 @@ std::string Scanner::lex_conf_string ()
     std::string s;
     tok = cur;
 
-#line 3815 "src/parse/lex_conf.cc"
+#line 3812 "src/parse/lex_conf.cc"
 {
 	unsigned char yych;
 	static const unsigned char yybm[] = {
@@ -3867,9 +3864,9 @@ std::string Scanner::lex_conf_string ()
 		}
 	}
 yy795:
-#line 296 "../src/parse/lex_conf.re"
+#line 293 "../src/parse/lex_conf.re"
 	{ goto end; }
-#line 3873 "src/parse/lex_conf.cc"
+#line 3870 "src/parse/lex_conf.cc"
 yy796:
 	++cur;
 	if (lim <= cur) YYFILL(1);
@@ -3877,15 +3874,15 @@ yy796:
 	if (yybm[0+yych] & 128) {
 		goto yy796;
 	}
-#line 292 "../src/parse/lex_conf.re"
+#line 289 "../src/parse/lex_conf.re"
 	{
         s = getstr(tok, cur);
         goto end;
     }
-#line 3886 "src/parse/lex_conf.cc"
+#line 3883 "src/parse/lex_conf.cc"
 yy799:
 	++cur;
-#line 276 "../src/parse/lex_conf.re"
+#line 273 "../src/parse/lex_conf.re"
 	{
         const char quote = tok[0];
         for (;;) {
@@ -3902,9 +3899,9 @@ yy799:
             }
         }
     }
-#line 3906 "src/parse/lex_conf.cc"
+#line 3903 "src/parse/lex_conf.cc"
 }
-#line 297 "../src/parse/lex_conf.re"
+#line 294 "../src/parse/lex_conf.re"
 
 end:
     lex_conf_semicolon ();
diff --git a/doc/manual/configurations/configurations.rst_ b/doc/manual/configurations/configurations.rst_
index bacf4095..ff6aad11 100644
--- a/doc/manual/configurations/configurations.rst_
+++ b/doc/manual/configurations/configurations.rst_
@@ -145,6 +145,12 @@
 ``re2c:define:YYSTAGP = 'YYSTAGP';``
     Replaces ``YYSTAGP`` identifier with the specified string.
 
+``re2c:eof = -1;``
+    Specifies the sentinel symbol used with EOF rule ``$`` to check for the end
+    of input in the generated lexer. Default value is ``-1`` (EOF rule is not
+    used). Other possible values include all valid code points. Only decimal
+    numbers are recognized.
+
 ``re2c:flags:8`` or ``re2c:flags:utf-8``
     Same as ``-8 --utf-8`` command-line option.
 
diff --git a/src/parse/lex_conf.re b/src/parse/lex_conf.re
index de2ec363..639d15f1 100644
--- a/src/parse/lex_conf.re
+++ b/src/parse/lex_conf.re
@@ -73,10 +73,7 @@ void Scanner::lex_conf(Opt &opts)
 
     "eof" {
         const int32_t eof = lex_conf_number();
-        if (eof < 0) {
-            msg.fatal(cur_loc(), "EOF symbol cannot have negative value");
-        }
-        opts.set_eof(static_cast<uint32_t>(eof));
+        opts.set_eof(eof < 0 ? NOEOF : static_cast<uint32_t>(eof));
         return;
     }
 
diff --git a/test/eof/eof_07.c b/test/eof/eof_07.c
index 5b862c5f..821338fe 100644
--- a/test/eof/eof_07.c
+++ b/test/eof/eof_07.c
@@ -1 +1 @@
-eof/eof_07.re:2:18: error: EOF symbol cannot have negative value
+eof/eof_07.re:3:6: error: EOF rule found, but 're2c:eof' configuration is not set
diff --git a/test/eof/eof_09.i.c b/test/eof/eof_09.i.c
new file mode 100644
index 00000000..c107a259
--- /dev/null
+++ b/test/eof/eof_09.i.c
@@ -0,0 +1,88 @@
+/* Generated by re2c */
+
+{
+	YYCTYPE yych;
+yy1_:
+	yych = *YYCURSOR;
+	switch (yych) {
+	case 'a':	goto yy4;
+	default:
+		if (YYLIMIT <= YYCURSOR) {
+			if (YYFILL () == 0) goto yy1_;
+			goto yyeof;
+		}
+		goto yy2;
+	}
+yy2:
+	++YYCURSOR;
+yy3:
+	{ return FAIL; }
+yy4:
+	++YYCURSOR;
+	{ return OK; }
+yyeof:
+	{ return EOF; }
+}
+
+
+
+{
+	YYCTYPE yych;
+	if (YYLIMIT <= YYCURSOR) YYFILL(1);
+	yych = *YYCURSOR;
+	switch (yych) {
+	case 'a':	goto yy10;
+	default:	goto yy8;
+	}
+yy8:
+	++YYCURSOR;
+	{ return FAIL; }
+yy10:
+	++YYCURSOR;
+	{ return OK; }
+}
+
+
+
+{
+	YYCTYPE yych;
+yy13_:
+	yych = *YYCURSOR;
+	switch (yych) {
+	case 'b':	goto yy16;
+	default:
+		if (YYLIMIT <= YYCURSOR) {
+			if (YYFILL () == 0) goto yy13_;
+			goto yyeof;
+		}
+		goto yy14;
+	}
+yy14:
+	++YYCURSOR;
+yy15:
+	{ return FAIL; }
+yy16:
+	++YYCURSOR;
+	{ return OK; }
+yyeof:
+	{ return EOF; }
+}
+
+
+
+{
+	YYCTYPE yych;
+	if (YYLIMIT <= YYCURSOR) YYFILL(1);
+	yych = *YYCURSOR;
+	switch (yych) {
+	case 'b':	goto yy22;
+	default:	goto yy20;
+	}
+yy20:
+	++YYCURSOR;
+	{ return FAIL; }
+yy22:
+	++YYCURSOR;
+	{ return OK; }
+}
+
diff --git a/test/eof/eof_09.i.re b/test/eof/eof_09.i.re
new file mode 100644
index 00000000..ceeffafa
--- /dev/null
+++ b/test/eof/eof_09.i.re
@@ -0,0 +1,29 @@
+/*!re2c
+    re2c:eof = 0;
+
+    *   { return FAIL; }
+    $   { return EOF; }
+    [a] { return OK; }
+*/
+
+/*!re2c
+    re2c:eof = -1;
+
+    *   { return FAIL; }
+    [a] { return OK; }
+*/
+
+/*!re2c
+    re2c:eof = 42;
+
+    *   { return FAIL; }
+    $   { return EOF; }
+    [b] { return OK; }
+*/
+
+/*!re2c
+    re2c:eof = -1;
+
+    *   { return FAIL; }
+    [b] { return OK; }
+*/
-- 
2.40.0