From: Ulya Trofimovich <skvadrik@gmail.com>
Date: Sun, 23 Dec 2018 19:32:29 +0000 (+0000)
Subject: Preparations to support #include: keep input files in a stack.
X-Git-Tag: 1.2~284
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=1edd26a35457c5835afd58b8fa8330d33e7a1192;p=re2c

Preparations to support #include: keep input files in a stack.
---

diff --git a/re2c/bootstrap/src/ast/lex.cc b/re2c/bootstrap/src/ast/lex.cc
index bbaeee18..c06bbee5 100644
--- a/re2c/bootstrap/src/ast/lex.cc
+++ b/re2c/bootstrap/src/ast/lex.cc
@@ -1,4 +1,4 @@
-/* Generated by re2c 1.1.1 on Sat Dec 22 19:57:50 2018 */
+/* Generated by re2c 1.1.1 on Sun Dec 23 19:24:34 2018 */
 #line 1 "../src/ast/lex.re"
 #include "src/util/c99_stdint.h"
 #include <stddef.h>
@@ -33,7 +33,7 @@ namespace re2c {
 #line 55 "../src/ast/lex.re"
 
 
-#line 112 "../src/ast/lex.re"
+#line 113 "../src/ast/lex.re"
 
 
 Scanner::ParseMode Scanner::echo(Output &out)
@@ -103,7 +103,7 @@ echo:
 		}
 	}
 	++YYCURSOR;
-#line 202 "../src/ast/lex.re"
+#line 203 "../src/ast/lex.re"
 	{
         if (!is_eof()) goto echo;
         out.wraw(tok, ptr);
@@ -113,7 +113,7 @@ echo:
 yy4:
 	++YYCURSOR;
 yy5:
-#line 220 "../src/ast/lex.re"
+#line 221 "../src/ast/lex.re"
 	{ goto echo; }
 #line 119 "src/ast/lex.cc"
 yy6:
@@ -124,7 +124,7 @@ yy6:
 	}
 	if (yych == '#') goto yy14;
 yy7:
-#line 214 "../src/ast/lex.re"
+#line 215 "../src/ast/lex.re"
 	{
         cline++;
         pos = cur;
@@ -173,7 +173,7 @@ yy14:
 	}
 yy16:
 	++YYCURSOR;
-#line 123 "../src/ast/lex.re"
+#line 124 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         return Parse;
@@ -457,7 +457,7 @@ yy76:
 yy78:
 	++YYCURSOR;
 	YYCURSOR = yyt1;
-#line 208 "../src/ast/lex.re"
+#line 209 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr + 1);
         set_sourceline();
@@ -584,7 +584,7 @@ yy107:
 	goto yy13;
 yy108:
 	++YYCURSOR;
-#line 144 "../src/ast/lex.re"
+#line 145 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.wdelay_yymaxfill();
@@ -614,7 +614,7 @@ yy114:
 	goto yy13;
 yy115:
 	++YYCURSOR;
-#line 133 "../src/ast/lex.re"
+#line 134 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         return Reuse;
@@ -670,7 +670,7 @@ yy128:
 	goto yy13;
 yy129:
 	++YYCURSOR;
-#line 180 "../src/ast/lex.re"
+#line 181 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         lex_tags(out, true);
@@ -679,7 +679,7 @@ yy129:
 #line 680 "src/ast/lex.cc"
 yy131:
 	++YYCURSOR;
-#line 128 "../src/ast/lex.re"
+#line 129 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         return Rules;
@@ -687,7 +687,7 @@ yy131:
 #line 688 "src/ast/lex.cc"
 yy133:
 	++YYCURSOR;
-#line 174 "../src/ast/lex.re"
+#line 175 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         lex_tags(out, false);
@@ -696,7 +696,7 @@ yy133:
 #line 697 "src/ast/lex.cc"
 yy135:
 	++YYCURSOR;
-#line 165 "../src/ast/lex.re"
+#line 166 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.wdelay_line_info_output();
@@ -716,7 +716,7 @@ yy138:
 	goto yy13;
 yy139:
 	++YYCURSOR;
-#line 138 "../src/ast/lex.re"
+#line 139 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         lex_end_of_comment(out);
@@ -741,7 +741,7 @@ yy144:
 	goto yy13;
 yy145:
 	++YYCURSOR;
-#line 158 "../src/ast/lex.re"
+#line 159 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.wdelay_state_goto(0);
@@ -764,7 +764,7 @@ yy149:
 	goto yy13;
 yy150:
 	++YYCURSOR;
-#line 186 "../src/ast/lex.re"
+#line 187 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.header_mode(true);
@@ -775,7 +775,7 @@ yy150:
 #line 776 "src/ast/lex.cc"
 yy152:
 	++YYCURSOR;
-#line 151 "../src/ast/lex.re"
+#line 152 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.wdelay_yymaxnmatch();
@@ -785,7 +785,7 @@ yy152:
 #line 786 "src/ast/lex.cc"
 yy154:
 	++YYCURSOR;
-#line 194 "../src/ast/lex.re"
+#line 195 "../src/ast/lex.re"
 	{
         out.wraw(tok, ptr);
         out.header_mode(false);
@@ -795,7 +795,7 @@ yy154:
     }
 #line 797 "src/ast/lex.cc"
 }
-#line 221 "../src/ast/lex.re"
+#line 222 "../src/ast/lex.re"
 
 }
 
@@ -819,18 +819,18 @@ void Scanner::lex_end_of_comment(Output &out)
 	}
 yy158:
 	++YYCURSOR;
-#line 228 "../src/ast/lex.re"
+#line 229 "../src/ast/lex.re"
 	{ fatal_lc(get_cline(), get_column(), "expected end of block"); }
 #line 825 "src/ast/lex.cc"
 yy160:
 	++YYCURSOR;
 yy161:
-#line 230 "../src/ast/lex.re"
+#line 231 "../src/ast/lex.re"
 	{ continue; }
 #line 831 "src/ast/lex.cc"
 yy162:
 	++YYCURSOR;
-#line 231 "../src/ast/lex.re"
+#line 232 "../src/ast/lex.re"
 	{ ++ignored; continue; }
 #line 836 "src/ast/lex.cc"
 yy164:
@@ -841,7 +841,7 @@ yy165:
 	yych = (YYCTYPE)*++YYCURSOR;
 	if (yych != '/') goto yy161;
 	++YYCURSOR;
-#line 232 "../src/ast/lex.re"
+#line 233 "../src/ast/lex.re"
 	{
             if (ignored > 0) {
                 cline += ignored;
@@ -852,7 +852,7 @@ yy165:
         }
 #line 854 "src/ast/lex.cc"
 }
-#line 240 "../src/ast/lex.re"
+#line 241 "../src/ast/lex.re"
 }
 }
 
@@ -918,7 +918,7 @@ void Scanner::lex_tags(Output &out, bool mtags)
 	}
 	++YYCURSOR;
 yy171:
-#line 247 "../src/ast/lex.re"
+#line 248 "../src/ast/lex.re"
 	{ fatal_lc(get_cline(), get_column(), "unrecognized configuration"); }
 #line 924 "src/ast/lex.cc"
 yy172:
@@ -928,12 +928,12 @@ yy172:
 	if (yybm[0+yych] & 128) {
 		goto yy172;
 	}
-#line 252 "../src/ast/lex.re"
+#line 253 "../src/ast/lex.re"
 	{ continue; }
 #line 934 "src/ast/lex.cc"
 yy175:
 	++YYCURSOR;
-#line 253 "../src/ast/lex.re"
+#line 254 "../src/ast/lex.re"
 	{ ++cline; continue; }
 #line 939 "src/ast/lex.cc"
 yy177:
@@ -954,7 +954,7 @@ yy180:
 	goto yy171;
 yy181:
 	++YYCURSOR;
-#line 254 "../src/ast/lex.re"
+#line 255 "../src/ast/lex.re"
 	{
             out.wdelay_tags(new ConfTags(fmt, sep), mtags);
             tok = pos = cur;
@@ -997,7 +997,7 @@ yy191:
 	goto yy184;
 yy192:
 	++YYCURSOR;
-#line 249 "../src/ast/lex.re"
+#line 250 "../src/ast/lex.re"
 	{ fmt = lex_conf_string(); continue; }
 #line 1003 "src/ast/lex.cc"
 yy194:
@@ -1008,11 +1008,11 @@ yy194:
 	yych = (YYCTYPE)*++YYCURSOR;
 	if (yych != 'r') goto yy184;
 	++YYCURSOR;
-#line 250 "../src/ast/lex.re"
+#line 251 "../src/ast/lex.re"
 	{ sep = lex_conf_string(); continue; }
 #line 1014 "src/ast/lex.cc"
 }
-#line 259 "../src/ast/lex.re"
+#line 260 "../src/ast/lex.re"
 }
 }
 
@@ -1133,7 +1133,7 @@ scan:
 yy201:
 	++YYCURSOR;
 yy202:
-#line 386 "../src/ast/lex.re"
+#line 387 "../src/ast/lex.re"
 	{
         fatal_lc(get_cline(), get_column(), "unexpected character: '%c'", *tok);
         goto scan;
@@ -1146,7 +1146,7 @@ yy203:
 	if (yybm[0+yych] & 16) {
 		goto yy203;
 	}
-#line 367 "../src/ast/lex.re"
+#line 368 "../src/ast/lex.re"
 	{ goto scan; }
 #line 1152 "src/ast/lex.cc"
 yy206:
@@ -1159,7 +1159,7 @@ yy206:
 		if (yych == '#') goto yy236;
 	}
 yy207:
-#line 374 "../src/ast/lex.re"
+#line 375 "../src/ast/lex.re"
 	{
         pos = cur;
         cline++;
@@ -1178,7 +1178,7 @@ yy208:
 	goto yy202;
 yy209:
 	++YYCURSOR;
-#line 285 "../src/ast/lex.re"
+#line 286 "../src/ast/lex.re"
 	{ yylval.regexp = lex_str('"'); return TOKEN_REGEXP; }
 #line 1184 "src/ast/lex.cc"
 yy211:
@@ -1195,7 +1195,7 @@ yy211:
 yy212:
 	++YYCURSOR;
 yy213:
-#line 295 "../src/ast/lex.re"
+#line 296 "../src/ast/lex.re"
 	{ return *tok; }
 #line 1201 "src/ast/lex.cc"
 yy214:
@@ -1204,7 +1204,7 @@ yy214:
 	goto yy202;
 yy215:
 	++YYCURSOR;
-#line 284 "../src/ast/lex.re"
+#line 285 "../src/ast/lex.re"
 	{ yylval.regexp = lex_str('\''); return TOKEN_REGEXP; }
 #line 1210 "src/ast/lex.cc"
 yy217:
@@ -1213,7 +1213,7 @@ yy217:
 	goto yy213;
 yy218:
 	++YYCURSOR;
-#line 362 "../src/ast/lex.re"
+#line 363 "../src/ast/lex.re"
 	{
         yylval.regexp = ast_dot(cline, get_column());
         return TOKEN_REGEXP;
@@ -1230,7 +1230,7 @@ yy221:
 	goto yy202;
 yy222:
 	++YYCURSOR;
-#line 277 "../src/ast/lex.re"
+#line 278 "../src/ast/lex.re"
 	{ return lex_clist(); }
 #line 1236 "src/ast/lex.cc"
 yy224:
@@ -1246,7 +1246,7 @@ yy226:
 	if (yybm[0+yych] & 32) {
 		goto yy225;
 	}
-#line 339 "../src/ast/lex.re"
+#line 340 "../src/ast/lex.re"
 	{
         if (!globopts->FFlag || lex_namedef_context_re2c()) {
             yylval.str = new std::string (tok, tok_len());
@@ -1273,7 +1273,7 @@ yy226:
 yy228:
 	yych = (YYCTYPE)*++YYCURSOR;
 	if (yych == '^') goto yy251;
-#line 286 "../src/ast/lex.re"
+#line 287 "../src/ast/lex.re"
 	{ yylval.regexp = lex_cls(false); return TOKEN_REGEXP; }
 #line 1279 "src/ast/lex.cc"
 yy230:
@@ -1298,7 +1298,7 @@ yy231:
 		}
 	}
 yy232:
-#line 269 "../src/ast/lex.re"
+#line 270 "../src/ast/lex.re"
 	{ lex_code_in_braces(); return TOKEN_CODE; }
 #line 1304 "src/ast/lex.cc"
 yy233:
@@ -1359,7 +1359,7 @@ yy238:
 		}
 	}
 yy240:
-#line 289 "../src/ast/lex.re"
+#line 290 "../src/ast/lex.re"
 	{
         const std::string *name = new std::string(tok + 1, tok_len() - 1);
         yylval.regexp = ast_tag(cline, get_column(), name, tok[0] == '#');
@@ -1368,17 +1368,17 @@ yy240:
 #line 1369 "src/ast/lex.cc"
 yy241:
 	++YYCURSOR;
-#line 282 "../src/ast/lex.re"
+#line 283 "../src/ast/lex.re"
 	{ tok = cur; return 0; }
 #line 1374 "src/ast/lex.cc"
 yy243:
 	++YYCURSOR;
-#line 280 "../src/ast/lex.re"
+#line 281 "../src/ast/lex.re"
 	{ lex_c_comment(); goto scan; }
 #line 1379 "src/ast/lex.cc"
 yy245:
 	++YYCURSOR;
-#line 279 "../src/ast/lex.re"
+#line 280 "../src/ast/lex.re"
 	{ lex_cpp_comment(); goto scan; }
 #line 1384 "src/ast/lex.cc"
 yy247:
@@ -1386,7 +1386,7 @@ yy247:
 	yych = (YYCTYPE)*(YYMARKER = ++YYCURSOR);
 	if (yych == '>') goto yy249;
 yy248:
-#line 270 "../src/ast/lex.re"
+#line 271 "../src/ast/lex.re"
 	{ lex_code_indented(); return TOKEN_CODE; }
 #line 1392 "src/ast/lex.cc"
 yy249:
@@ -1421,7 +1421,7 @@ yy249:
 	}
 yy251:
 	++YYCURSOR;
-#line 287 "../src/ast/lex.re"
+#line 288 "../src/ast/lex.re"
 	{ yylval.regexp = lex_cls(true);  return TOKEN_REGEXP; }
 #line 1427 "src/ast/lex.cc"
 yy253:
@@ -1431,7 +1431,7 @@ yy253:
 yy254:
 	++YYCURSOR;
 yy255:
-#line 323 "../src/ast/lex.re"
+#line 324 "../src/ast/lex.re"
 	{
         fatal_lc(get_cline(), get_column(),
             "illegal closure form, use '{n}', '{n,}', '{n,m}' where n and m are numbers");
@@ -1494,7 +1494,7 @@ yy261:
 	}
 yy263:
 	p = yyt1;
-#line 272 "../src/ast/lex.re"
+#line 273 "../src/ast/lex.re"
 	{
         yylval.str = new std::string(p, static_cast<size_t>(cur - p));
         return tok[0] == ':' ? TOKEN_CJUMP : TOKEN_CNEXT;
@@ -1513,7 +1513,7 @@ yy265:
 	goto yy255;
 yy266:
 	++YYCURSOR;
-#line 297 "../src/ast/lex.re"
+#line 298 "../src/ast/lex.re"
 	{
         if (!s_to_u32_unsafe (tok + 1, cur - 1, yylval.bounds.min)) {
             fatal_lc(get_cline(), get_column(), "repetition count overflow");
@@ -1524,7 +1524,7 @@ yy266:
 #line 1525 "src/ast/lex.cc"
 yy268:
 	++YYCURSOR;
-#line 328 "../src/ast/lex.re"
+#line 329 "../src/ast/lex.re"
 	{
         if (!globopts->FFlag) {
             fatal_lc(get_cline(), get_column(),
@@ -1552,7 +1552,7 @@ yy272:
 	goto yy235;
 yy274:
 	++YYCURSOR;
-#line 315 "../src/ast/lex.re"
+#line 316 "../src/ast/lex.re"
 	{
         if (!s_to_u32_unsafe (tok + 1, cur - 2, yylval.bounds.min)) {
             fatal_lc(get_cline(), get_column(), "repetition lower bound overflow");
@@ -1567,13 +1567,13 @@ yy276:
 	goto yy235;
 yy277:
 	++YYCURSOR;
-#line 337 "../src/ast/lex.re"
+#line 338 "../src/ast/lex.re"
 	{ return TOKEN_CONF; }
 #line 1573 "src/ast/lex.cc"
 yy279:
 	++YYCURSOR;
 	p = yyt1;
-#line 305 "../src/ast/lex.re"
+#line 306 "../src/ast/lex.re"
 	{
         if (!s_to_u32_unsafe (tok + 1, p, yylval.bounds.min)) {
             fatal_lc(get_cline(), get_column(), "repetition lower bound overflow");
@@ -1639,7 +1639,7 @@ yy286:
 yy288:
 	++YYCURSOR;
 	YYCURSOR = yyt1;
-#line 369 "../src/ast/lex.re"
+#line 370 "../src/ast/lex.re"
 	{
         set_sourceline ();
         return TOKEN_LINE_INFO;
@@ -1670,7 +1670,7 @@ yy294:
 	if (yych == '\n') goto yy235;
 	goto yy291;
 }
-#line 390 "../src/ast/lex.re"
+#line 391 "../src/ast/lex.re"
 
 }
 
@@ -1732,7 +1732,7 @@ bool Scanner::lex_namedef_context_re2c()
 		}
 	}
 yy297:
-#line 397 "../src/ast/lex.re"
+#line 398 "../src/ast/lex.re"
 	{ return false; }
 #line 1738 "src/ast/lex.cc"
 yy298:
@@ -1751,11 +1751,11 @@ yy301:
 	if (yych == '>') goto yy300;
 	++YYCURSOR;
 	YYCURSOR = yyt1;
-#line 396 "../src/ast/lex.re"
+#line 397 "../src/ast/lex.re"
 	{ return true; }
 #line 1757 "src/ast/lex.cc"
 }
-#line 398 "../src/ast/lex.re"
+#line 399 "../src/ast/lex.re"
 
 }
 
@@ -1809,7 +1809,7 @@ bool Scanner::lex_namedef_context_flex()
 		yyt1 = YYCURSOR;
 		goto yy307;
 	}
-#line 406 "../src/ast/lex.re"
+#line 407 "../src/ast/lex.re"
 	{ return false; }
 #line 1815 "src/ast/lex.cc"
 yy307:
@@ -1826,17 +1826,17 @@ yy307:
 		if (yych == '{') goto yy310;
 	}
 	YYCURSOR = yyt1;
-#line 405 "../src/ast/lex.re"
+#line 406 "../src/ast/lex.re"
 	{ return true; }
 #line 1832 "src/ast/lex.cc"
 yy310:
 	++YYCURSOR;
 	YYCURSOR = yyt1;
-#line 404 "../src/ast/lex.re"
+#line 405 "../src/ast/lex.re"
 	{ return false; }
 #line 1838 "src/ast/lex.cc"
 }
-#line 407 "../src/ast/lex.re"
+#line 408 "../src/ast/lex.re"
 
 }
 
@@ -1895,7 +1895,7 @@ yy312:
 	if (yych <= '!') goto yy316;
 	if (yych == '>') goto yy319;
 yy315:
-#line 417 "../src/ast/lex.re"
+#line 418 "../src/ast/lex.re"
 	{ goto cond; }
 #line 1901 "src/ast/lex.cc"
 yy316:
@@ -1904,16 +1904,16 @@ yy316:
 	yych = (YYCTYPE)*YYCURSOR;
 	if (yych == '\t') goto yy316;
 	if (yych == ' ') goto yy316;
-#line 415 "../src/ast/lex.re"
+#line 416 "../src/ast/lex.re"
 	{ kind = TOKEN_CSETUP; goto cond; }
 #line 1910 "src/ast/lex.cc"
 yy319:
 	++YYCURSOR;
-#line 416 "../src/ast/lex.re"
+#line 417 "../src/ast/lex.re"
 	{ kind = TOKEN_CZERO; goto end; }
 #line 1915 "src/ast/lex.cc"
 }
-#line 418 "../src/ast/lex.re"
+#line 419 "../src/ast/lex.re"
 
 cond:
     tok = cur;
@@ -1970,12 +1970,12 @@ cond:
 	}
 yy323:
 	++YYCURSOR;
-#line 424 "../src/ast/lex.re"
+#line 425 "../src/ast/lex.re"
 	{ goto error; }
 #line 1976 "src/ast/lex.cc"
 yy325:
 	++YYCURSOR;
-#line 423 "../src/ast/lex.re"
+#line 424 "../src/ast/lex.re"
 	{ if (!cl->empty()) goto error; cl->insert("*"); goto next; }
 #line 1981 "src/ast/lex.cc"
 yy327:
@@ -1985,11 +1985,11 @@ yy327:
 	if (yybm[0+yych] & 128) {
 		goto yy327;
 	}
-#line 422 "../src/ast/lex.re"
+#line 423 "../src/ast/lex.re"
 	{ cl->insert(std::string(tok, tok_len())); goto next; }
 #line 1991 "src/ast/lex.cc"
 }
-#line 425 "../src/ast/lex.re"
+#line 426 "../src/ast/lex.re"
 
 next:
 
@@ -2044,7 +2044,7 @@ next:
 	}
 	++YYCURSOR;
 yy333:
-#line 430 "../src/ast/lex.re"
+#line 431 "../src/ast/lex.re"
 	{ goto error; }
 #line 2050 "src/ast/lex.cc"
 yy334:
@@ -2068,12 +2068,12 @@ yy335:
 	if (yybm[0+yych] & 128) {
 		goto yy335;
 	}
-#line 428 "../src/ast/lex.re"
+#line 429 "../src/ast/lex.re"
 	{ goto cond; }
 #line 2074 "src/ast/lex.cc"
 yy338:
 	++YYCURSOR;
-#line 429 "../src/ast/lex.re"
+#line 430 "../src/ast/lex.re"
 	{ goto end; }
 #line 2079 "src/ast/lex.cc"
 yy340:
@@ -2093,7 +2093,7 @@ yy340:
 	YYCURSOR = YYMARKER;
 	goto yy333;
 }
-#line 431 "../src/ast/lex.re"
+#line 432 "../src/ast/lex.re"
 
 end:
     yylval.clist = cl;
@@ -2137,13 +2137,13 @@ code:
 	}
 yy345:
 	++YYCURSOR;
-#line 454 "../src/ast/lex.re"
+#line 455 "../src/ast/lex.re"
 	{ fail_if_eof(); goto code; }
 #line 2143 "src/ast/lex.cc"
 yy347:
 	++YYCURSOR;
 yy348:
-#line 459 "../src/ast/lex.re"
+#line 460 "../src/ast/lex.re"
 	{ goto code; }
 #line 2149 "src/ast/lex.cc"
 yy349:
@@ -2156,7 +2156,7 @@ yy349:
 		if (yych == ' ') goto yy357;
 	}
 yy350:
-#line 447 "../src/ast/lex.re"
+#line 448 "../src/ast/lex.re"
 	{
         while (isspace(tok[0])) ++tok;
         while (cur > tok && isspace(cur[-1])) --cur;
@@ -2170,7 +2170,7 @@ yy351:
 	goto yy348;
 yy352:
 	++YYCURSOR;
-#line 458 "../src/ast/lex.re"
+#line 459 "../src/ast/lex.re"
 	{ lex_string(cur[-1]); goto code; }
 #line 2176 "src/ast/lex.cc"
 yy354:
@@ -2180,27 +2180,27 @@ yy354:
 	goto yy348;
 yy355:
 	++YYCURSOR;
-#line 455 "../src/ast/lex.re"
+#line 456 "../src/ast/lex.re"
 	{ fatal_l(get_cline(), "Curly braces are not allowed after ':='"); }
 #line 2186 "src/ast/lex.cc"
 yy357:
 	++YYCURSOR;
 	YYCURSOR -= 1;
-#line 446 "../src/ast/lex.re"
+#line 447 "../src/ast/lex.re"
 	{ goto code; }
 #line 2192 "src/ast/lex.cc"
 yy359:
 	++YYCURSOR;
-#line 456 "../src/ast/lex.re"
+#line 457 "../src/ast/lex.re"
 	{ lex_c_comment(); goto code; }
 #line 2197 "src/ast/lex.cc"
 yy361:
 	++YYCURSOR;
-#line 457 "../src/ast/lex.re"
+#line 458 "../src/ast/lex.re"
 	{ lex_cpp_comment(); goto code; }
 #line 2202 "src/ast/lex.cc"
 }
-#line 460 "../src/ast/lex.re"
+#line 461 "../src/ast/lex.re"
 
 }
 
@@ -2272,13 +2272,13 @@ code:
 	}
 yy365:
 	++YYCURSOR;
-#line 480 "../src/ast/lex.re"
+#line 481 "../src/ast/lex.re"
 	{ fail_if_eof(); goto code; }
 #line 2278 "src/ast/lex.cc"
 yy367:
 	++YYCURSOR;
 yy368:
-#line 484 "../src/ast/lex.re"
+#line 485 "../src/ast/lex.re"
 	{ goto code; }
 #line 2284 "src/ast/lex.cc"
 yy369:
@@ -2288,7 +2288,7 @@ yy369:
 	}
 	if (yych == '#') goto yy382;
 yy370:
-#line 479 "../src/ast/lex.re"
+#line 480 "../src/ast/lex.re"
 	{ pos = cur; cline++; goto code; }
 #line 2294 "src/ast/lex.cc"
 yy371:
@@ -2297,7 +2297,7 @@ yy371:
 	goto yy368;
 yy372:
 	++YYCURSOR;
-#line 483 "../src/ast/lex.re"
+#line 484 "../src/ast/lex.re"
 	{ lex_string(cur[-1]); goto code; }
 #line 2303 "src/ast/lex.cc"
 yy374:
@@ -2307,12 +2307,12 @@ yy374:
 	goto yy368;
 yy375:
 	++YYCURSOR;
-#line 477 "../src/ast/lex.re"
+#line 478 "../src/ast/lex.re"
 	{ ++depth; goto code; }
 #line 2313 "src/ast/lex.cc"
 yy377:
 	++YYCURSOR;
-#line 469 "../src/ast/lex.re"
+#line 470 "../src/ast/lex.re"
 	{
         if (--depth == 0) {
             yylval.code = new Code(get_fname (), line, tok, tok_len ());
@@ -2346,12 +2346,12 @@ yy382:
 	}
 yy384:
 	++YYCURSOR;
-#line 481 "../src/ast/lex.re"
+#line 482 "../src/ast/lex.re"
 	{ lex_c_comment(); goto code; }
 #line 2352 "src/ast/lex.cc"
 yy386:
 	++YYCURSOR;
-#line 482 "../src/ast/lex.re"
+#line 483 "../src/ast/lex.re"
 	{ lex_cpp_comment(); goto code; }
 #line 2357 "src/ast/lex.cc"
 yy388:
@@ -2410,7 +2410,7 @@ yy396:
 yy398:
 	++YYCURSOR;
 	YYCURSOR = yyt1;
-#line 478 "../src/ast/lex.re"
+#line 479 "../src/ast/lex.re"
 	{ set_sourceline (); goto code; }
 #line 2416 "src/ast/lex.cc"
 yy400:
@@ -2438,7 +2438,7 @@ yy404:
 	if (yych == '\n') goto yy381;
 	goto yy401;
 }
-#line 485 "../src/ast/lex.re"
+#line 486 "../src/ast/lex.re"
 
 }
 
@@ -2472,18 +2472,18 @@ loop:
 	}
 yy407:
 	++YYCURSOR;
-#line 495 "../src/ast/lex.re"
+#line 496 "../src/ast/lex.re"
 	{ fail_if_eof(); goto loop; }
 #line 2478 "src/ast/lex.cc"
 yy409:
 	++YYCURSOR;
 yy410:
-#line 496 "../src/ast/lex.re"
+#line 497 "../src/ast/lex.re"
 	{ goto loop; }
 #line 2484 "src/ast/lex.cc"
 yy411:
 	++YYCURSOR;
-#line 494 "../src/ast/lex.re"
+#line 495 "../src/ast/lex.re"
 	{ pos = cur; ++cline; goto loop; }
 #line 2489 "src/ast/lex.cc"
 yy413:
@@ -2492,7 +2492,7 @@ yy413:
 	goto yy410;
 yy414:
 	++YYCURSOR;
-#line 492 "../src/ast/lex.re"
+#line 493 "../src/ast/lex.re"
 	{ if (cur[-1] == delim) return; else goto loop; }
 #line 2498 "src/ast/lex.cc"
 yy416:
@@ -2505,11 +2505,11 @@ yy416:
 	}
 yy417:
 	++YYCURSOR;
-#line 493 "../src/ast/lex.re"
+#line 494 "../src/ast/lex.re"
 	{ goto loop; }
 #line 2511 "src/ast/lex.cc"
 }
-#line 497 "../src/ast/lex.re"
+#line 498 "../src/ast/lex.re"
 
 }
 
@@ -2533,18 +2533,18 @@ loop:
 	}
 yy421:
 	++YYCURSOR;
-#line 506 "../src/ast/lex.re"
+#line 507 "../src/ast/lex.re"
 	{ fail_if_eof(); goto loop; }
 #line 2539 "src/ast/lex.cc"
 yy423:
 	++YYCURSOR;
 yy424:
-#line 507 "../src/ast/lex.re"
+#line 508 "../src/ast/lex.re"
 	{ goto loop; }
 #line 2545 "src/ast/lex.cc"
 yy425:
 	++YYCURSOR;
-#line 505 "../src/ast/lex.re"
+#line 506 "../src/ast/lex.re"
 	{ pos = cur; ++cline; goto loop; }
 #line 2550 "src/ast/lex.cc"
 yy427:
@@ -2555,11 +2555,11 @@ yy428:
 	yych = (YYCTYPE)*++YYCURSOR;
 	if (yych != '/') goto yy424;
 	++YYCURSOR;
-#line 504 "../src/ast/lex.re"
+#line 505 "../src/ast/lex.re"
 	{ return; }
 #line 2561 "src/ast/lex.cc"
 }
-#line 508 "../src/ast/lex.re"
+#line 509 "../src/ast/lex.re"
 
 }
 
@@ -2582,18 +2582,18 @@ loop:
 	}
 yy433:
 	++YYCURSOR;
-#line 516 "../src/ast/lex.re"
+#line 517 "../src/ast/lex.re"
 	{ fail_if_eof(); goto loop; }
 #line 2588 "src/ast/lex.cc"
 yy435:
 	++YYCURSOR;
 yy436:
-#line 517 "../src/ast/lex.re"
+#line 518 "../src/ast/lex.re"
 	{ goto loop; }
 #line 2594 "src/ast/lex.cc"
 yy437:
 	++YYCURSOR;
-#line 515 "../src/ast/lex.re"
+#line 516 "../src/ast/lex.re"
 	{ pos = cur; ++cline; return; }
 #line 2599 "src/ast/lex.cc"
 yy439:
@@ -2601,7 +2601,7 @@ yy439:
 	if (yych == '\n') goto yy437;
 	goto yy436;
 }
-#line 518 "../src/ast/lex.re"
+#line 519 "../src/ast/lex.re"
 
 }
 
@@ -2619,16 +2619,16 @@ fst:
 	if (YYLIMIT <= YYCURSOR) YYFILL(1);
 	yych = (YYCTYPE)*YYCURSOR;
 	if (yych == ']') goto yy443;
-#line 530 "../src/ast/lex.re"
+#line 531 "../src/ast/lex.re"
 	{ l = lex_cls_chr(); goto snd; }
 #line 2625 "src/ast/lex.cc"
 yy443:
 	++YYCURSOR;
-#line 529 "../src/ast/lex.re"
+#line 530 "../src/ast/lex.re"
 	{ return ast_cls(cline, c0, cls, neg); }
 #line 2630 "src/ast/lex.cc"
 }
-#line 531 "../src/ast/lex.re"
+#line 532 "../src/ast/lex.re"
 
 snd:
     
@@ -2639,7 +2639,7 @@ snd:
 	yych = (YYCTYPE)*(YYMARKER = YYCURSOR);
 	if (yych == '-') goto yy448;
 yy447:
-#line 534 "../src/ast/lex.re"
+#line 535 "../src/ast/lex.re"
 	{ u = l; goto add; }
 #line 2645 "src/ast/lex.cc"
 yy448:
@@ -2650,7 +2650,7 @@ yy448:
 yy450:
 	++YYCURSOR;
 	YYCURSOR -= 1;
-#line 535 "../src/ast/lex.re"
+#line 536 "../src/ast/lex.re"
 	{
             u = lex_cls_chr();
             if (l > u) {
@@ -2661,7 +2661,7 @@ yy450:
         }
 #line 2663 "src/ast/lex.cc"
 }
-#line 543 "../src/ast/lex.re"
+#line 544 "../src/ast/lex.re"
 
 add:
     cls->push_back(ASTRange(l, u, c));
@@ -2690,18 +2690,18 @@ uint32_t Scanner::lex_cls_chr()
 	}
 yy454:
 	++YYCURSOR;
-#line 555 "../src/ast/lex.re"
+#line 556 "../src/ast/lex.re"
 	{ fail_if_eof(); return 0; }
 #line 2696 "src/ast/lex.cc"
 yy456:
 	++YYCURSOR;
 yy457:
-#line 561 "../src/ast/lex.re"
+#line 562 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>(tok[0]); }
 #line 2702 "src/ast/lex.cc"
 yy458:
 	++YYCURSOR;
-#line 556 "../src/ast/lex.re"
+#line 557 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "newline in character class"); }
 #line 2707 "src/ast/lex.cc"
 yy460:
@@ -2762,13 +2762,13 @@ yy461:
 		}
 	}
 yy462:
-#line 559 "../src/ast/lex.re"
+#line 560 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in escape sequence"); }
 #line 2768 "src/ast/lex.cc"
 yy463:
 	++YYCURSOR;
 yy464:
-#line 574 "../src/ast/lex.re"
+#line 575 "../src/ast/lex.re"
 	{
             warn.useless_escape(cline, get_column(), tok[1]);
             return static_cast<uint8_t>(tok[1]);
@@ -2780,7 +2780,7 @@ yy465:
 	goto yy464;
 yy466:
 	++YYCURSOR;
-#line 572 "../src/ast/lex.re"
+#line 573 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('-'); }
 #line 2786 "src/ast/lex.cc"
 yy468:
@@ -2789,7 +2789,7 @@ yy468:
 	if (yych <= '/') goto yy469;
 	if (yych <= '7') goto yy493;
 yy469:
-#line 558 "../src/ast/lex.re"
+#line 559 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in octal escape sequence"); }
 #line 2795 "src/ast/lex.cc"
 yy470:
@@ -2807,7 +2807,7 @@ yy471:
 		if (yych <= 'f') goto yy495;
 	}
 yy472:
-#line 557 "../src/ast/lex.re"
+#line 558 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in hexadecimal escape sequence"); }
 #line 2813 "src/ast/lex.cc"
 yy473:
@@ -2825,47 +2825,47 @@ yy473:
 	}
 yy474:
 	++YYCURSOR;
-#line 571 "../src/ast/lex.re"
+#line 572 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\\'); }
 #line 2831 "src/ast/lex.cc"
 yy476:
 	++YYCURSOR;
-#line 573 "../src/ast/lex.re"
+#line 574 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>(']'); }
 #line 2836 "src/ast/lex.cc"
 yy478:
 	++YYCURSOR;
-#line 564 "../src/ast/lex.re"
+#line 565 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\a'); }
 #line 2841 "src/ast/lex.cc"
 yy480:
 	++YYCURSOR;
-#line 565 "../src/ast/lex.re"
+#line 566 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\b'); }
 #line 2846 "src/ast/lex.cc"
 yy482:
 	++YYCURSOR;
-#line 566 "../src/ast/lex.re"
+#line 567 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\f'); }
 #line 2851 "src/ast/lex.cc"
 yy484:
 	++YYCURSOR;
-#line 567 "../src/ast/lex.re"
+#line 568 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\n'); }
 #line 2856 "src/ast/lex.cc"
 yy486:
 	++YYCURSOR;
-#line 568 "../src/ast/lex.re"
+#line 569 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\r'); }
 #line 2861 "src/ast/lex.cc"
 yy488:
 	++YYCURSOR;
-#line 569 "../src/ast/lex.re"
+#line 570 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\t'); }
 #line 2866 "src/ast/lex.cc"
 yy490:
 	++YYCURSOR;
-#line 570 "../src/ast/lex.re"
+#line 571 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\v'); }
 #line 2871 "src/ast/lex.cc"
 yy492:
@@ -2930,7 +2930,7 @@ yy497:
 	}
 yy498:
 	++YYCURSOR;
-#line 563 "../src/ast/lex.re"
+#line 564 "../src/ast/lex.re"
 	{ return unesc_oct(tok, cur); }
 #line 2936 "src/ast/lex.cc"
 yy500:
@@ -2959,7 +2959,7 @@ yy501:
 	}
 yy502:
 	++YYCURSOR;
-#line 562 "../src/ast/lex.re"
+#line 563 "../src/ast/lex.re"
 	{ return unesc_hex(tok, cur); }
 #line 2965 "src/ast/lex.cc"
 yy504:
@@ -2985,7 +2985,7 @@ yy505:
 		goto yy494;
 	}
 }
-#line 578 "../src/ast/lex.re"
+#line 579 "../src/ast/lex.re"
 
 }
 
@@ -3012,13 +3012,13 @@ uint32_t Scanner::lex_str_chr(char quote, bool &end)
 	}
 yy508:
 	++YYCURSOR;
-#line 588 "../src/ast/lex.re"
+#line 589 "../src/ast/lex.re"
 	{ fail_if_eof(); return 0; }
 #line 3018 "src/ast/lex.cc"
 yy510:
 	++YYCURSOR;
 yy511:
-#line 594 "../src/ast/lex.re"
+#line 595 "../src/ast/lex.re"
 	{
             end = tok[0] == quote;
             return static_cast<uint8_t>(tok[0]);
@@ -3026,7 +3026,7 @@ yy511:
 #line 3027 "src/ast/lex.cc"
 yy512:
 	++YYCURSOR;
-#line 589 "../src/ast/lex.re"
+#line 590 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "newline in character string"); }
 #line 3032 "src/ast/lex.cc"
 yy514:
@@ -3082,13 +3082,13 @@ yy515:
 		}
 	}
 yy516:
-#line 592 "../src/ast/lex.re"
+#line 593 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in escape sequence"); }
 #line 3088 "src/ast/lex.cc"
 yy517:
 	++YYCURSOR;
 yy518:
-#line 608 "../src/ast/lex.re"
+#line 609 "../src/ast/lex.re"
 	{
             if (tok[1] != quote) {
                 warn.useless_escape(cline, get_column(), tok[1]);
@@ -3106,7 +3106,7 @@ yy520:
 	if (yych <= '/') goto yy521;
 	if (yych <= '7') goto yy543;
 yy521:
-#line 591 "../src/ast/lex.re"
+#line 592 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in octal escape sequence"); }
 #line 3112 "src/ast/lex.cc"
 yy522:
@@ -3124,7 +3124,7 @@ yy523:
 		if (yych <= 'f') goto yy545;
 	}
 yy524:
-#line 590 "../src/ast/lex.re"
+#line 591 "../src/ast/lex.re"
 	{ fatal_lc(l, c, "syntax error in hexadecimal escape sequence"); }
 #line 3130 "src/ast/lex.cc"
 yy525:
@@ -3142,42 +3142,42 @@ yy525:
 	}
 yy526:
 	++YYCURSOR;
-#line 607 "../src/ast/lex.re"
+#line 608 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\\'); }
 #line 3148 "src/ast/lex.cc"
 yy528:
 	++YYCURSOR;
-#line 600 "../src/ast/lex.re"
+#line 601 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\a'); }
 #line 3153 "src/ast/lex.cc"
 yy530:
 	++YYCURSOR;
-#line 601 "../src/ast/lex.re"
+#line 602 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\b'); }
 #line 3158 "src/ast/lex.cc"
 yy532:
 	++YYCURSOR;
-#line 602 "../src/ast/lex.re"
+#line 603 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\f'); }
 #line 3163 "src/ast/lex.cc"
 yy534:
 	++YYCURSOR;
-#line 603 "../src/ast/lex.re"
+#line 604 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\n'); }
 #line 3168 "src/ast/lex.cc"
 yy536:
 	++YYCURSOR;
-#line 604 "../src/ast/lex.re"
+#line 605 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\r'); }
 #line 3173 "src/ast/lex.cc"
 yy538:
 	++YYCURSOR;
-#line 605 "../src/ast/lex.re"
+#line 606 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\t'); }
 #line 3178 "src/ast/lex.cc"
 yy540:
 	++YYCURSOR;
-#line 606 "../src/ast/lex.re"
+#line 607 "../src/ast/lex.re"
 	{ return static_cast<uint8_t>('\v'); }
 #line 3183 "src/ast/lex.cc"
 yy542:
@@ -3242,7 +3242,7 @@ yy547:
 	}
 yy548:
 	++YYCURSOR;
-#line 599 "../src/ast/lex.re"
+#line 600 "../src/ast/lex.re"
 	{ return unesc_oct(tok, cur); }
 #line 3248 "src/ast/lex.cc"
 yy550:
@@ -3271,7 +3271,7 @@ yy551:
 	}
 yy552:
 	++YYCURSOR;
-#line 598 "../src/ast/lex.re"
+#line 599 "../src/ast/lex.re"
 	{ return unesc_hex(tok, cur); }
 #line 3277 "src/ast/lex.cc"
 yy554:
@@ -3297,7 +3297,7 @@ yy555:
 		goto yy544;
 	}
 }
-#line 614 "../src/ast/lex.re"
+#line 615 "../src/ast/lex.re"
 
 }
 
@@ -3375,18 +3375,18 @@ sourceline:
 		}
 	}
 	++YYCURSOR;
-#line 647 "../src/ast/lex.re"
+#line 649 "../src/ast/lex.re"
 	{ --cur; return; }
 #line 3381 "src/ast/lex.cc"
 yy560:
 	++YYCURSOR;
 yy561:
-#line 648 "../src/ast/lex.re"
+#line 650 "../src/ast/lex.re"
 	{ goto sourceline; }
 #line 3387 "src/ast/lex.cc"
 yy562:
 	++YYCURSOR;
-#line 646 "../src/ast/lex.re"
+#line 648 "../src/ast/lex.re"
 	{ tok = cur; return; }
 #line 3392 "src/ast/lex.cc"
 yy564:
@@ -3405,7 +3405,7 @@ yy566:
 	if (yybm[0+yych] & 64) {
 		goto yy566;
 	}
-#line 633 "../src/ast/lex.re"
+#line 634 "../src/ast/lex.re"
 	{
         if (!s_to_u32_unsafe (tok, cur, cline)) {
             fatal_lc(get_cline(), get_column(), "line number overflow");
@@ -3429,13 +3429,14 @@ yy571:
 	goto yy561;
 yy572:
 	++YYCURSOR;
-#line 640 "../src/ast/lex.re"
+#line 641 "../src/ast/lex.re"
 	{
-        in.escaped_file_name = std::string (tok + 1, tok_len () - 2); // strip quotes
-        strrreplace (in.escaped_file_name, "\\", "\\\\");
+        std::string &name = files.top()->escaped_name;
+        name = std::string(tok + 1, tok_len () - 2); // strip quotes
+        strrreplace(name, "\\", "\\\\");
         goto sourceline;
     }
-#line 3439 "src/ast/lex.cc"
+#line 3440 "src/ast/lex.cc"
 yy574:
 	++YYCURSOR;
 	if (YYLIMIT <= YYCURSOR) YYFILL(1);
@@ -3444,7 +3445,7 @@ yy574:
 	if (yych == '\n') goto yy571;
 	goto yy569;
 }
-#line 649 "../src/ast/lex.re"
+#line 651 "../src/ast/lex.re"
 
 }
 
diff --git a/re2c/bootstrap/src/ast/lex.h b/re2c/bootstrap/src/ast/lex.h
index f83447c0..762da47f 100644
--- a/re2c/bootstrap/src/ast/lex.h
+++ b/re2c/bootstrap/src/ast/lex.h
@@ -1,6 +1,7 @@
-/* Generated by re2c 1.1.1 on Sat Dec 22 19:57:50 2018 */
+/* Generated by re2c 1.1.1 on Sun Dec 23 19:24:34 2018 */
 
 #include <string.h>
+#include "src/util/forbid_copy.h"
 
 namespace re2c {
 
diff --git a/re2c/src/ast/input.cc b/re2c/src/ast/input.cc
index b7073ec8..64853b1e 100644
--- a/re2c/src/ast/input.cc
+++ b/re2c/src/ast/input.cc
@@ -1,33 +1,28 @@
 #include "src/ast/input.h"
+#include "src/conf/msg.h"
 #include "src/util/string_utils.h"
 
 namespace re2c {
 
-Input::Input (const char * fn)
-    : file (NULL)
-    , file_name (fn)
-    , escaped_file_name (fn)
-{
-    strrreplace (escaped_file_name, "\\", "\\\\");
-}
+Input::Input(): file(NULL), name(), escaped_name() {}
 
-bool Input::open ()
+bool Input::open(const char *filename)
 {
-    if (file_name == "<stdin>")
-    {
-        file = stdin;
-    }
-    else
-    {
-        file = fopen (file_name.c_str (), "rb");
+    name = escaped_name = filename;
+    strrreplace(escaped_name, "\\", "\\\\");
+
+    file = name == "<stdin>" ? stdin : fopen(name.c_str(), "rb");
+    if (!file) {
+        error("cannot open source file: %s", name.c_str());
+        return false;
     }
-    return file != NULL;
+
+    return true;
 }
 
-Input::~Input ()
+Input::~Input()
 {
-    if (file != NULL && file != stdin)
-    {
+    if (file != NULL && file != stdin) {
         fclose (file);
     }
 }
diff --git a/re2c/src/ast/input.h b/re2c/src/ast/input.h
index 1da3dfc8..7c7131fc 100644
--- a/re2c/src/ast/input.h
+++ b/re2c/src/ast/input.h
@@ -3,22 +3,21 @@
 
 #include <stdio.h>
 #include <string>
-
 #include "src/util/forbid_copy.h"
 
 namespace re2c {
 
 struct Input
 {
-    FILE * file;
-    const std::string file_name;
-    std::string escaped_file_name;
+    FILE *file;
+    std::string name;
+    std::string escaped_name;
 
-    explicit Input (const char * fn);
-    ~Input ();
-    bool open ();
+    Input();
+    ~Input();
+    bool open(const char *filename);
 
-    FORBID_COPY (Input);
+    FORBID_COPY(Input);
 };
 
 } // namespace re2c
diff --git a/re2c/src/ast/lex.re b/re2c/src/ast/lex.re
index 3d433f08..5021783a 100644
--- a/re2c/src/ast/lex.re
+++ b/re2c/src/ast/lex.re
@@ -56,6 +56,7 @@ namespace re2c {
 
 /*!header:re2c:on*/
 #include <string.h>
+#include "src/util/forbid_copy.h"
 
 namespace re2c {
 
@@ -638,8 +639,9 @@ sourceline:
     }
 
     dstring {
-        in.escaped_file_name = std::string (tok + 1, tok_len () - 2); // strip quotes
-        strrreplace (in.escaped_file_name, "\\", "\\\\");
+        std::string &name = files.top()->escaped_name;
+        name = std::string(tok + 1, tok_len () - 2); // strip quotes
+        strrreplace(name, "\\", "\\\\");
         goto sourceline;
     }
 
diff --git a/re2c/src/ast/scanner.cc b/re2c/src/ast/scanner.cc
index b50383c4..b128880d 100644
--- a/re2c/src/ast/scanner.cc
+++ b/re2c/src/ast/scanner.cc
@@ -9,7 +9,55 @@ namespace re2c {
 
 class Warn;
 
-Scanner::Scanner(Input &i, Warn &w): ScannerState(), in(i), warn(w) {}
+Scanner::Scanner(Warn &w)
+    : ScannerState()
+    , files()
+    , warn(w)
+{}
+
+Scanner::~Scanner()
+{
+    for (; !files.empty(); ) {
+        delete files.top();
+        files.pop();
+    }
+}
+
+bool Scanner::push_file(const char *filename)
+{
+    // push buffer tail back to file - we'll return to it later
+    if (!files.empty()) {
+        int err = fseek(files.top()->file, lim - cur, SEEK_CUR);
+        if (err != 0) return false;
+    }
+
+    // open new file and place place at the top of stack
+    Input *f = new Input;
+    files.push(f);
+    if (!f->open(filename)) return false;
+
+    // refill buffer
+    return fill(BSIZE);
+}
+
+bool Scanner::read(size_t want)
+{
+    const char *stop = lim + want;
+    assert(!files.empty());
+    for (;;) {
+        Input *f = files.top();
+        lim += fread(lim, 1, want, f->file);
+
+        // buffer filled
+        if (lim == stop) return true;
+
+        // the first file must remain at the bottom of the stack
+        if (files.size() == 1) break;
+        delete f;
+        files.pop();
+    }
+    return false;
+}
 
 bool Scanner::fill(size_t need)
 {
@@ -36,8 +84,7 @@ bool Scanner::fill(size_t need)
         free = BSIZE - copy;
     }
 
-    lim += fread(lim, 1, free, in.file);
-    if (lim < bot + BSIZE) {
+    if (!read(free)) {
         eof = lim;
         memset(lim, 0, YYMAXFILL);
         lim += YYMAXFILL;
diff --git a/re2c/src/ast/scanner.h b/re2c/src/ast/scanner.h
index 1b746fb8..bfe39c07 100644
--- a/re2c/src/ast/scanner.h
+++ b/re2c/src/ast/scanner.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include "src/util/c99_stdint.h"
 #include <sys/types.h>
+#include <stack>
 #include <string>
 
 #include "src/ast/input.h"
@@ -26,9 +27,26 @@ struct AST;
 
 class Scanner: private ScannerState
 {
-    Input & in;
+public:
+    enum ParseMode {Stop, Parse, Reuse, Rules};
+
+private:
+    std::stack<Input*> files;
     Warn &warn;
 
+public:
+    explicit Scanner(Warn &w);
+    ~Scanner();
+    bool push_file(const char *filename);
+    ParseMode echo(Output &out);
+    int scan(const conopt_t *globopts);
+    void lex_conf(Opt &opts);
+    uint32_t get_cline() const;
+    uint32_t get_column() const;
+    const std::string & get_fname () const;
+
+private:
+    bool read(size_t want);
     bool fill(size_t need);
     void lex_end_of_comment(Output &out);
     void lex_code_indented();
@@ -59,16 +77,6 @@ class Scanner: private ScannerState
     bool is_eof() const;
     void fail_if_eof() const;
 
-public:
-    enum ParseMode {Stop, Parse, Reuse, Rules};
-
-    Scanner(Input&, Warn &w);
-    ParseMode echo(Output &out);
-    int scan(const conopt_t *globopts);
-    void lex_conf(Opt &opts);
-    uint32_t get_cline() const;
-    uint32_t get_column() const;
-    const std::string & get_fname () const;
     FORBID_COPY (Scanner);
 };
 
@@ -80,7 +88,7 @@ inline size_t Scanner::tok_len () const
 
 inline const std::string & Scanner::get_fname () const
 {
-    return in.escaped_file_name;
+    return files.top()->escaped_name;
 }
 
 inline uint32_t Scanner::get_cline() const
diff --git a/re2c/src/main.cc b/re2c/src/main.cc
index 999ffed7..ffeb569a 100644
--- a/re2c/src/main.cc
+++ b/re2c/src/main.cc
@@ -2,7 +2,6 @@
 #include "src/ast/scanner.h"
 #include "src/code/output.h"
 #include "src/compile.h"
-#include "src/conf/msg.h"
 #include "src/conf/opt.h"
 #include "src/conf/warn.h"
 
@@ -20,12 +19,9 @@ int main(int, char *argv[])
         case EXIT_FAIL: return 1;
     }
 
-    re2c::Input input(opts.source_file);
-    if (!input.open()) {
-        error("cannot open source file: %s", opts.source_file);
-        return 1;
-    }
-    Scanner scanner(input, warn);
+    Scanner scanner(warn);
+    if (!scanner.push_file(opts.source_file)) return 1;
+
     Output output(warn);
 
     compile(scanner, output, opts);