This file is indexed.

/usr/share/perl5/Fatal.pm is in libautodie-perl 2.10-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
package Fatal;

use 5.008;  # 5.8.x needed for autodie
use Carp;
use strict;
use warnings;
use Tie::RefHash;   # To cache subroutine refs
use Config;

use constant PERL510     => ( $] >= 5.010 );

use constant LEXICAL_TAG => q{:lexical};
use constant VOID_TAG    => q{:void};
use constant INSIST_TAG  => q{!};

use constant ERROR_NOARGS    => 'Cannot use lexical %s with no arguments';
use constant ERROR_VOID_LEX  => VOID_TAG.' cannot be used with lexical scope';
use constant ERROR_LEX_FIRST => LEXICAL_TAG.' must be used as first argument';
use constant ERROR_NO_LEX    => "no %s can only start with ".LEXICAL_TAG;
use constant ERROR_BADNAME   => "Bad subroutine name for %s: %s";
use constant ERROR_NOTSUB    => "%s is not a Perl subroutine";
use constant ERROR_NOT_BUILT => "%s is neither a builtin, nor a Perl subroutine";
use constant ERROR_NOHINTS   => "No user hints defined for %s";

use constant ERROR_CANT_OVERRIDE => "Cannot make the non-overridable builtin %s fatal";

use constant ERROR_NO_IPC_SYS_SIMPLE => "IPC::System::Simple required for Fatalised/autodying system()";

use constant ERROR_IPC_SYS_SIMPLE_OLD => "IPC::System::Simple version %f required for Fatalised/autodying system().  We only have version %f";

use constant ERROR_AUTODIE_CONFLICT => q{"no autodie '%s'" is not allowed while "use Fatal '%s'" is in effect};

use constant ERROR_FATAL_CONFLICT => q{"use Fatal '%s'" is not allowed while "no autodie '%s'" is in effect};

use constant ERROR_58_HINTS => q{Non-subroutine %s hints for %s are not supported under Perl 5.8.x};

# Older versions of IPC::System::Simple don't support all the
# features we need.

use constant MIN_IPC_SYS_SIMPLE_VER => 0.12;

# All the Fatal/autodie modules share the same version number.
our $VERSION = '2.10';

our $Debug ||= 0;

# EWOULDBLOCK values for systems that don't supply their own.
# Even though this is defined with our, that's to help our
# test code.  Please don't rely upon this variable existing in
# the future.

our %_EWOULDBLOCK = (
    MSWin32 => 33,
);

# the linux parisc port has separate EAGAIN and EWOULDBLOCK,
# and the kernel returns EAGAIN
my $try_EAGAIN = ($^O eq 'linux' and $Config{archname} =~ /hppa|parisc/) ? 1 : 0;

# We have some tags that can be passed in for use with import.
# These are all assumed to be CORE::

my %TAGS = (
    ':io'      => [qw(:dbm :file :filesys :ipc :socket
                       read seek sysread syswrite sysseek )],
    ':dbm'     => [qw(dbmopen dbmclose)],
    ':file'    => [qw(open close flock sysopen fcntl fileno binmode
                     ioctl truncate chmod)],
    ':filesys' => [qw(opendir closedir chdir link unlink rename mkdir
                      symlink rmdir readlink umask)],
    ':ipc'     => [qw(:msg :semaphore :shm pipe)],
    ':msg'     => [qw(msgctl msgget msgrcv msgsnd)],
    ':threads' => [qw(fork)],
    ':semaphore'=>[qw(semctl semget semop)],
    ':shm'     => [qw(shmctl shmget shmread)],
    ':system'  => [qw(system exec)],

    # Can we use qw(getpeername getsockname)? What do they do on failure?
    # TODO - Can socket return false?
    ':socket'  => [qw(accept bind connect getsockopt listen recv send
                   setsockopt shutdown socketpair)],

    # Our defaults don't include system(), because it depends upon
    # an optional module, and it breaks the exotic form.
    #
    # This *may* change in the future.  I'd love IPC::System::Simple
    # to be a dependency rather than a recommendation, and hence for
    # system() to be autodying by default.

    ':default' => [qw(:io :threads)],

    # Everything in v2.07 and brefore. This was :default less chmod.
    ':v207'    => [qw(:threads :dbm :filesys :ipc :socket read seek sysread
                   syswrite sysseek open close flock sysopen fcntl fileno
                   binmode ioctl truncate)],

    # Version specific tags.  These allow someone to specify
    # use autodie qw(:1.994) and know exactly what they'll get.

    ':1.994' => [qw(:v207)],
    ':1.995' => [qw(:v207)],
    ':1.996' => [qw(:v207)],
    ':1.997' => [qw(:v207)],
    ':1.998' => [qw(:v207)],
    ':1.999' => [qw(:v207)],
    ':1.999_01' => [qw(:v207)],
    ':2.00'  => [qw(:v207)],
    ':2.01'  => [qw(:v207)],
    ':2.02'  => [qw(:v207)],
    ':2.03'  => [qw(:v207)],
    ':2.04'  => [qw(:v207)],
    ':2.05'  => [qw(:v207)],
    ':2.06'  => [qw(:v207)],
    ':2.06_01' => [qw(:v207)],
    ':2.07'  => [qw(:v207)],     # Last release without chmod
    ':2.08'  => [qw(:default)],
    ':2.09'  => [qw(:default)],
    ':2.10'  => [qw(:default)],
);

# chmod was only introduced in 2.07

$TAGS{':all'}  = [ keys %TAGS ];

# This hash contains subroutines for which we should
# subroutine() // die() rather than subroutine() || die()

my %Use_defined_or;

# CORE::open returns undef on failure.  It can legitimately return
# 0 on success, eg: open(my $fh, '-|') || exec(...);

@Use_defined_or{qw(
    CORE::fork
    CORE::recv
    CORE::send
    CORE::open
    CORE::fileno
    CORE::read
    CORE::readlink
    CORE::sysread
    CORE::syswrite
    CORE::sysseek
    CORE::umask
)} = ();

# Cached_fatalised_sub caches the various versions of our
# fatalised subs as they're produced.  This means we don't
# have to build our own replacement of CORE::open and friends
# for every single package that wants to use them.

my %Cached_fatalised_sub = ();

# Every time we're called with package scope, we record the subroutine
# (including package or CORE::) in %Package_Fatal.  This allows us
# to detect illegal combinations of autodie and Fatal, and makes sure
# we don't accidently make a Fatal function autodying (which isn't
# very useful).

my %Package_Fatal = ();

# The first time we're called with a user-sub, we cache it here.
# In the case of a "no autodie ..." we put back the cached copy.

my %Original_user_sub = ();

# Is_fatalised_sub simply records a big map of fatalised subroutine
# refs.  It means we can avoid repeating work, or fatalising something
# we've already processed.

my  %Is_fatalised_sub = ();
tie %Is_fatalised_sub, 'Tie::RefHash';

# We use our package in a few hash-keys.  Having it in a scalar is
# convenient.  The "guard $PACKAGE" string is used as a key when
# setting up lexical guards.

my $PACKAGE       = __PACKAGE__;
my $PACKAGE_GUARD = "guard $PACKAGE";
my $NO_PACKAGE    = "no $PACKAGE";      # Used to detect 'no autodie'

# Here's where all the magic happens when someone write 'use Fatal'
# or 'use autodie'.

sub import {
    my $class        = shift(@_);
    my @original_args = @_;
    my $void         = 0;
    my $lexical      = 0;
    my $insist_hints = 0;

    my ($pkg, $filename) = caller();

    @_ or return;   # 'use Fatal' is a no-op.

    # If we see the :lexical flag, then _all_ arguments are
    # changed lexically

    if ($_[0] eq LEXICAL_TAG) {
        $lexical = 1;
        shift @_;

        # If we see no arguments and :lexical, we assume they
        # wanted ':default'.

        if (@_ == 0) {
            push(@_, ':default');
        }

        # Don't allow :lexical with :void, it's needlessly confusing.
        if ( grep { $_ eq VOID_TAG } @_ ) {
            croak(ERROR_VOID_LEX);
        }
    }

    if ( grep { $_ eq LEXICAL_TAG } @_ ) {
        # If we see the lexical tag as the non-first argument, complain.
        croak(ERROR_LEX_FIRST);
    }

    my @fatalise_these =  @_;

    # Thiese subs will get unloaded at the end of lexical scope.
    my %unload_later;

    # This hash helps us track if we've alredy done work.
    my %done_this;

    # NB: we're using while/shift rather than foreach, since
    # we'll be modifying the array as we walk through it.

    while (my $func = shift @fatalise_these) {

        if ($func eq VOID_TAG) {

            # When we see :void, set the void flag.
            $void = 1;

        } elsif ($func eq INSIST_TAG) {

            $insist_hints = 1;

        } elsif (exists $TAGS{$func}) {

            # When it's a tag, expand it.
            push(@fatalise_these, @{ $TAGS{$func} });

        } else {

            # Otherwise, fatalise it.

            # Check to see if there's an insist flag at the front.
            # If so, remove it, and insist we have hints for this sub.
            my $insist_this;

            if ($func =~ s/^!//) {
                $insist_this = 1;
            }

            # TODO: Even if we've already fatalised, we should
            # check we've done it with hints (if $insist_hints).

            # If we've already made something fatal this call,
            # then don't do it twice.

            next if $done_this{$func};

            # We're going to make a subroutine fatalistic.
            # However if we're being invoked with 'use Fatal qw(x)'
            # and we've already been called with 'no autodie qw(x)'
            # in the same scope, we consider this to be an error.
            # Mixing Fatal and autodie effects was considered to be
            # needlessly confusing on p5p.

            my $sub = $func;
            $sub = "${pkg}::$sub" unless $sub =~ /::/;

            # If we're being called as Fatal, and we've previously
            # had a 'no X' in scope for the subroutine, then complain
            # bitterly.

            if (! $lexical and $^H{$NO_PACKAGE}{$sub}) {
                 croak(sprintf(ERROR_FATAL_CONFLICT, $func, $func));
            }

            # We're not being used in a confusing way, so make
            # the sub fatal.  Note that _make_fatal returns the
            # old (original) version of the sub, or undef for
            # built-ins.

            my $sub_ref = $class->_make_fatal(
                $func, $pkg, $void, $lexical, $filename,
                ( $insist_this || $insist_hints )
            );

            $done_this{$func}++;

            $Original_user_sub{$sub} ||= $sub_ref;

            # If we're making lexical changes, we need to arrange
            # for them to be cleaned at the end of our scope, so
            # record them here.

            $unload_later{$func} = $sub_ref if $lexical;
        }
    }

    if ($lexical) {

        # Dark magic to have autodie work under 5.8
        # Copied from namespace::clean, that copied it from
        # autobox, that found it on an ancient scroll written
        # in blood.

        # This magic bit causes %^H to be lexically scoped.

        $^H |= 0x020000;

        # Our package guard gets invoked when we leave our lexical
        # scope.

        push(@ { $^H{$PACKAGE_GUARD} }, autodie::Scope::Guard->new(sub {
            $class->_install_subs($pkg, \%unload_later);
        }));

        # To allow others to determine when autodie was in scope,
        # and with what arguments, we also set a %^H hint which
        # is how we were called.

        # This feature should be considered EXPERIMENTAL, and
        # may change without notice.  Please e-mail pjf@cpan.org
        # if you're actually using it.

        $^H{autodie} = "$PACKAGE @original_args";

    }

    return;

}

# The code here is originally lifted from namespace::clean,
# by Robert "phaylon" Sedlacek.
#
# It's been redesigned after feedback from ikegami on perlmonks.
# See http://perlmonks.org/?node_id=693338 .  Ikegami rocks.
#
# Given a package, and hash of (subname => subref) pairs,
# we install the given subroutines into the package.  If
# a subref is undef, the subroutine is removed.  Otherwise
# it replaces any existing subs which were already there.

sub _install_subs {
    my ($class, $pkg, $subs_to_reinstate) = @_;

    my $pkg_sym = "${pkg}::";

    while(my ($sub_name, $sub_ref) = each %$subs_to_reinstate) {

        my $full_path = $pkg_sym.$sub_name;

        # Copy symbols across to temp area.

        no strict 'refs';   ## no critic

        local *__tmp = *{ $full_path };

        # Nuke the old glob.
        { no strict; delete $pkg_sym->{$sub_name}; }    ## no critic

        # Copy innocent bystanders back.  Note that we lose
        # formats; it seems that Perl versions up to 5.10.0
        # have a bug which causes copying formats to end up in
        # the scalar slot.  Thanks to Ben Morrow for spotting this.

        foreach my $slot (qw( SCALAR ARRAY HASH IO ) ) {
            next unless defined *__tmp{ $slot };
            *{ $full_path } = *__tmp{ $slot };
        }

        # Put back the old sub (if there was one).

        if ($sub_ref) {

            no strict;  ## no critic
            *{ $pkg_sym . $sub_name } = $sub_ref;
        }
    }

    return;
}

sub unimport {
    my $class = shift;

    # Calling "no Fatal" must start with ":lexical"
    if ($_[0] ne LEXICAL_TAG) {
        croak(sprintf(ERROR_NO_LEX,$class));
    }

    shift @_;   # Remove :lexical

    my $pkg = (caller)[0];

    # If we've been called with arguments, then the developer
    # has explicitly stated 'no autodie qw(blah)',
    # in which case, we disable Fatalistic behaviour for 'blah'.

    my @unimport_these = @_ ? @_ : ':all';

    while (my $symbol = shift @unimport_these) {

        if ($symbol =~ /^:/) {

            # Looks like a tag!  Expand it!
            push(@unimport_these, @{ $TAGS{$symbol} });

            next;
        }

        my $sub = $symbol;
        $sub = "${pkg}::$sub" unless $sub =~ /::/;

        # If 'blah' was already enabled with Fatal (which has package
        # scope) then, this is considered an error.

        if (exists $Package_Fatal{$sub}) {
            croak(sprintf(ERROR_AUTODIE_CONFLICT,$symbol,$symbol));
        }

        # Record 'no autodie qw($sub)' as being in effect.
        # This is to catch conflicting semantics elsewhere
        # (eg, mixing Fatal with no autodie)

        $^H{$NO_PACKAGE}{$sub} = 1;

        if (my $original_sub = $Original_user_sub{$sub}) {
            # Hey, we've got an original one of these, put it back.
            $class->_install_subs($pkg, { $symbol => $original_sub });
            next;
        }

        # We don't have an original copy of the sub, on the assumption
        # it's core (or doesn't exist), we'll just nuke it.

        $class->_install_subs($pkg,{ $symbol => undef });

    }

    return;

}

# TODO - This is rather terribly inefficient right now.

# NB: Perl::Critic's dump-autodie-tag-contents depends upon this
# continuing to work.

{
    my %tag_cache;

    sub _expand_tag {
        my ($class, $tag) = @_;

        if (my $cached = $tag_cache{$tag}) {
            return $cached;
        }

        if (not exists $TAGS{$tag}) {
            croak "Invalid exception class $tag";
        }

        my @to_process = @{$TAGS{$tag}};

        my @taglist = ();

        while (my $item = shift @to_process) {
            if ($item =~ /^:/) {
                # Expand :tags
                push(@to_process, @{$TAGS{$item}} );
            }
            else {
                push(@taglist, "CORE::$item");
            }
        }

        $tag_cache{$tag} = \@taglist;

        return \@taglist;

    }

}

# This code is from the original Fatal.  It scares me.
# It is 100% compatible with the 5.10.0 Fatal module, right down
# to the scary 'XXXX' comment.  ;)

sub fill_protos {
    my $proto = shift;
    my ($n, $isref, @out, @out1, $seen_semi) = -1;
    while ($proto =~ /\S/) {
        $n++;
        push(@out1,[$n,@out]) if $seen_semi;
        push(@out, $1 . "{\$_[$n]}"), next if $proto =~ s/^\s*\\([\@%\$\&])//;
        push(@out, "\$_[$n]"),        next if $proto =~ s/^\s*([_*\$&])//;
        push(@out, "\@_[$n..\$#_]"),  last if $proto =~ s/^\s*(;\s*)?\@//;
        $seen_semi = 1, $n--,         next if $proto =~ s/^\s*;//; # XXXX ????
        die "Internal error: Unknown prototype letters: \"$proto\"";
    }
    push(@out1,[$n+1,@out]);
    return @out1;
}

# This is a backwards compatible version of _write_invocation.  It's
# recommended you don't use it.

sub write_invocation {
    my ($core, $call, $name, $void, @args) = @_;

    return Fatal->_write_invocation(
        $core, $call, $name, $void,
        0,      # Lexical flag
        undef,  # Sub, unused in legacy mode
        undef,  # Subref, unused in legacy mode.
        @args
    );
}

# This version of _write_invocation is used internally.  It's not
# recommended you call it from external code, as the interface WILL
# change in the future.

sub _write_invocation {

    my ($class, $core, $call, $name, $void, $lexical, $sub, $sref, @argvs) = @_;

    if (@argvs == 1) {        # No optional arguments

        my @argv = @{$argvs[0]};
        shift @argv;

        return $class->_one_invocation($core,$call,$name,$void,$sub,! $lexical, $sref, @argv);

    } else {
        my $else = "\t";
        my (@out, @argv, $n);
        while (@argvs) {
            @argv = @{shift @argvs};
            $n = shift @argv;

            my $condition = "\@_ == $n";

            if (@argv and $argv[-1] =~ /#_/) {
                # This argv ends with '@' in the prototype, so it matches
                # any number of args >= the number of expressions in the
                # argv.
                $condition = "\@_ >= $n";
            }

            push @out, "${else}if ($condition) {\n";

            $else = "\t} els";

        push @out, $class->_one_invocation($core,$call,$name,$void,$sub,! $lexical, $sref, @argv);
        }
        push @out, qq[
            }
            die "Internal error: $name(\@_): Do not expect to get ", scalar(\@_), " arguments";
    ];

        return join '', @out;
    }
}


# This is a slim interface to ensure backward compatibility with
# anyone doing very foolish things with old versions of Fatal.

sub one_invocation {
    my ($core, $call, $name, $void, @argv) = @_;

    return Fatal->_one_invocation(
        $core, $call, $name, $void,
        undef,   # Sub.  Unused in back-compat mode.
        1,       # Back-compat flag
        undef,   # Subref, unused in back-compat mode.
        @argv
    );

}

# This is the internal interface that generates code.
# NOTE: This interface WILL change in the future.  Please do not
# call this subroutine directly.

# TODO: Whatever's calling this code has already looked up hints.  Pass
# them in, rather than look them up a second time.

sub _one_invocation {
    my ($class, $core, $call, $name, $void, $sub, $back_compat, $sref, @argv) = @_;


    # If someone is calling us directly (a child class perhaps?) then
    # they could try to mix void without enabling backwards
    # compatibility.  We just don't support this at all, so we gripe
    # about it rather than doing something unwise.

    if ($void and not $back_compat) {
        Carp::confess("Internal error: :void mode not supported with $class");
    }

    # @argv only contains the results of the in-built prototype
    # function, and is therefore safe to interpolate in the
    # code generators below.

    # TODO - The following clobbers context, but that's what the
    #        old Fatal did.  Do we care?

    if ($back_compat) {

        # Use Fatal qw(system) will never be supported.  It generated
        # a compile-time error with legacy Fatal, and there's no reason
        # to support it when autodie does a better job.

        if ($call eq 'CORE::system') {
            return q{
                croak("UNIMPLEMENTED: use Fatal qw(system) not supported.");
            };
        }

        local $" = ', ';

        if ($void) {
            return qq/return (defined wantarray)?$call(@argv):
                   $call(@argv) || Carp::croak("Can't $name(\@_)/ .
                   ($core ? ': $!' : ', \$! is \"$!\"') . '")'
        } else {
            return qq{return $call(@argv) || Carp::croak("Can't $name(\@_)} .
                   ($core ? ': $!' : ', \$! is \"$!\"') . '")';
        }
    }

    # The name of our original function is:
    #   $call if the function is CORE
    #   $sub if our function is non-CORE

    # The reason for this is that $call is what we're actualling
    # calling.  For our core functions, this is always
    # CORE::something.  However for user-defined subs, we're about to
    # replace whatever it is that we're calling; as such, we actually
    # calling a subroutine ref.

    my $human_sub_name = $core ? $call : $sub;

    # Should we be testing to see if our result is defined, or
    # just true?

    my $use_defined_or;

    my $hints;      # All user-sub hints, including list hints.

    if ( $core ) {

        # Core hints are built into autodie.

        $use_defined_or = exists ( $Use_defined_or{$call} );

    }
    else {

        # User sub hints are looked up using autodie::hints,
        # since users may wish to add their own hints.

        require autodie::hints;

        $hints = autodie::hints->get_hints_for( $sref );

        # We'll look up the sub's fullname.  This means we
        # get better reports of where it came from in our
        # error messages, rather than what imported it.

        $human_sub_name = autodie::hints->sub_fullname( $sref );

    }

    # Checks for special core subs.

    if ($call eq 'CORE::system') {

        # Leverage IPC::System::Simple if we're making an autodying
        # system.

        local $" = ", ";

        # We need to stash $@ into $E, rather than using
        # local $@ for the whole sub.  If we don't then
        # any exceptions from internal errors in autodie/Fatal
        # will mysteriously disappear before propogating
        # upwards.

        return qq{
            my \$retval;
            my \$E;


            {
                local \$@;

                eval {
                    \$retval = IPC::System::Simple::system(@argv);
                };

                \$E = \$@;
            }

            if (\$E) {

                # TODO - This can't be overridden in child
                # classes!

                die autodie::exception::system->new(
                    function => q{CORE::system}, args => [ @argv ],
                    message => "\$E", errno => \$!,
                );
            }

            return \$retval;
        };

    }

    local $" = ', ';

    # If we're going to throw an exception, here's the code to use.
    my $die = qq{
        die $class->throw(
            function => q{$human_sub_name}, args => [ @argv ],
            pragma => q{$class}, errno => \$!,
            context => \$context, return => \$retval,
            eval_error => \$@
        )
    };

    if ($call eq 'CORE::flock') {

        # flock needs special treatment.  When it fails with
        # LOCK_UN and EWOULDBLOCK, then it's not really fatal, it just
        # means we couldn't get the lock right now.

        require POSIX;      # For POSIX::EWOULDBLOCK

        local $@;   # Don't blat anyone else's $@.

        # Ensure that our vendor supports EWOULDBLOCK.  If they
        # don't (eg, Windows), then we use known values for its
        # equivalent on other systems.

        my $EWOULDBLOCK = eval { POSIX::EWOULDBLOCK(); }
                          || $_EWOULDBLOCK{$^O}
                          || _autocroak("Internal error - can't overload flock - EWOULDBLOCK not defined on this system.");
        my $EAGAIN = $EWOULDBLOCK;
        if ($try_EAGAIN) {
            $EAGAIN = eval { POSIX::EAGAIN(); }
                          || _autocroak("Internal error - can't overload flock - EAGAIN not defined on this system.");
        }

        require Fcntl;      # For Fcntl::LOCK_NB

        return qq{

            my \$context = wantarray() ? "list" : "scalar";

            # Try to flock.  If successful, return it immediately.

            my \$retval = $call(@argv);
            return \$retval if \$retval;

            # If we failed, but we're using LOCK_NB and
            # returned EWOULDBLOCK, it's not a real error.

            if (\$_[1] & Fcntl::LOCK_NB() and
                (\$! == $EWOULDBLOCK or
                ($try_EAGAIN and \$! == $EAGAIN ))) {
                return \$retval;
            }

            # Otherwise, we failed.  Die noisily.

            $die;

        };
    }

    # AFAIK everything that can be given an unopned filehandle
    # will fail if it tries to use it, so we don't really need
    # the 'unopened' warning class here.  Especially since they
    # then report the wrong line number.

    # Other warnings are disabled because they produce excessive
    # complaints from smart-match hints under 5.10.1.

    my $code = qq[
        no warnings qw(unopened uninitialized numeric);

        if (wantarray) {
            my \@results = $call(@argv);
            my \$retval  = \\\@results;
            my \$context = "list";

    ];

    if ( $hints and ( ref($hints->{list} ) || "" ) eq 'CODE' ) {

        # NB: Subroutine hints are passed as a full list.
        # This differs from the 5.10.0 smart-match behaviour,
        # but means that context unaware subroutines can use
        # the same hints in both list and scalar context.

        $code .= qq{
            if ( \$hints->{list}->(\@results) ) { $die };
        };
    }
    elsif ( PERL510 and $hints ) {
        $code .= qq{
            if ( \@results ~~ \$hints->{list} ) { $die };
        };
    }
    elsif ( $hints ) {
        croak sprintf(ERROR_58_HINTS, 'list', $sub);
    }
    else {
        $code .= qq{
            # An empty list, or a single undef is failure
            if (! \@results or (\@results == 1 and ! defined \$results[0])) {
                $die;
            }
        }
    }

    # Tidy up the end of our wantarray call.

    $code .= qq[
            return \@results;
        }
    ];


    # Otherwise, we're in scalar context.
    # We're never in a void context, since we have to look
    # at the result.

    $code .= qq{
        my \$retval  = $call(@argv);
        my \$context = "scalar";
    };

    if ( $hints and ( ref($hints->{scalar} ) || "" ) eq 'CODE' ) {

        # We always call code refs directly, since that always
        # works in 5.8.x, and always works in 5.10.1

        return $code .= qq{
            if ( \$hints->{scalar}->(\$retval) ) { $die };
            return \$retval;
        };

    }
    elsif (PERL510 and $hints) {
        return $code . qq{

            if ( \$retval ~~ \$hints->{scalar} ) { $die };

            return \$retval;
        };
    }
    elsif ( $hints ) {
        croak sprintf(ERROR_58_HINTS, 'scalar', $sub);
    }

    return $code .
    ( $use_defined_or ? qq{

        $die if not defined \$retval;

        return \$retval;

    } : qq{

        return \$retval || $die;

    } ) ;

}

# This returns the old copy of the sub, so we can
# put it back at end of scope.

# TODO : Check to make sure prototypes are restored correctly.

# TODO: Taking a huge list of arguments is awful.  Rewriting to
#       take a hash would be lovely.

# TODO - BACKCOMPAT - This is not yet compatible with 5.10.0

sub _make_fatal {
    my($class, $sub, $pkg, $void, $lexical, $filename, $insist) = @_;
    my($name, $code, $sref, $real_proto, $proto, $core, $call, $hints);
    my $ini = $sub;

    $sub = "${pkg}::$sub" unless $sub =~ /::/;

    # Figure if we're using lexical or package semantics and
    # twiddle the appropriate bits.

    if (not $lexical) {
        $Package_Fatal{$sub} = 1;
    }

    # TODO - We *should* be able to do skipping, since we know when
    # we've lexicalised / unlexicalised a subroutine.

    $name = $sub;
    $name =~ s/.*::// or $name =~ s/^&//;

    warn  "# _make_fatal: sub=$sub pkg=$pkg name=$name void=$void\n" if $Debug;
    croak(sprintf(ERROR_BADNAME, $class, $name)) unless $name =~ /^\w+$/;

    if (defined(&$sub)) {   # user subroutine

        # NOTE: Previously we would localise $@ at this point, so
        # the following calls to eval {} wouldn't interfere with anything
        # that's already in $@.  Unfortunately, it would also stop
        # any of our croaks from triggering(!), which is even worse.

        # This could be something that we've fatalised that
        # was in core.

        if ( $Package_Fatal{$sub} and do { local $@; eval { prototype "CORE::$name" } } ) {

            # Something we previously made Fatal that was core.
            # This is safe to replace with an autodying to core
            # version.

            $core  = 1;
            $call  = "CORE::$name";
            $proto = prototype $call;

            # We return our $sref from this subroutine later
            # on, indicating this subroutine should be placed
            # back when we're finished.

            $sref = \&$sub;

        } else {

            # If this is something we've already fatalised or played with,
            # then look-up the name of the original sub for the rest of
            # our processing.

            $sub = $Is_fatalised_sub{\&$sub} || $sub;

            # A regular user sub, or a user sub wrapping a
            # core sub.

            $sref = \&$sub;
            $proto = prototype $sref;
            $call = '&$sref';
            require autodie::hints;

            $hints = autodie::hints->get_hints_for( $sref );

            # If we've insisted on hints, but don't have them, then
            # bail out!

            if ($insist and not $hints) {
                croak(sprintf(ERROR_NOHINTS, $name));
            }

            # Otherwise, use the default hints if we don't have
            # any.

            $hints ||= autodie::hints::DEFAULT_HINTS();

        }

    } elsif ($sub eq $ini && $sub !~ /^CORE::GLOBAL::/) {
        # Stray user subroutine
        croak(sprintf(ERROR_NOTSUB,$sub));

    } elsif ($name eq 'system') {

        # If we're fatalising system, then we need to load
        # helper code.

        # The business with $E is to avoid clobbering our caller's
        # $@, and to avoid $@ being localised when we croak.

        my $E;

        {
            local $@;

            eval {
                require IPC::System::Simple; # Only load it if we need it.
                require autodie::exception::system;
            };
            $E = $@;
        }

        if ($E) { croak ERROR_NO_IPC_SYS_SIMPLE; }

        # Make sure we're using a recent version of ISS that actually
        # support fatalised system.
        if ($IPC::System::Simple::VERSION < MIN_IPC_SYS_SIMPLE_VER) {
            croak sprintf(
            ERROR_IPC_SYS_SIMPLE_OLD, MIN_IPC_SYS_SIMPLE_VER,
            $IPC::System::Simple::VERSION
            );
        }

        $call = 'CORE::system';
        $name = 'system';
        $core = 1;

    } elsif ($name eq 'exec') {
        # Exec doesn't have a prototype.  We don't care.  This
        # breaks the exotic form with lexical scope, and gives
        # the regular form a "do or die" beaviour as expected.

        $call = 'CORE::exec';
        $name = 'exec';
        $core = 1;

    } else {            # CORE subroutine
        my $E;
        {
            local $@;
            $proto = eval { prototype "CORE::$name" };
            $E = $@;
        }
        croak(sprintf(ERROR_NOT_BUILT,$name)) if $E;
        croak(sprintf(ERROR_CANT_OVERRIDE,$name)) if not defined $proto;
        $core = 1;
        $call = "CORE::$name";
    }

    if (defined $proto) {
        $real_proto = " ($proto)";
    } else {
        $real_proto = '';
        $proto = '@';
    }

    my $true_name = $core ? $call : $sub;

    # TODO: This caching works, but I don't like using $void and
    # $lexical as keys.  In particular, I suspect our code may end up
    # wrapping already wrapped code when autodie and Fatal are used
    # together.

    # NB: We must use '$sub' (the name plus package) and not
    # just '$name' (the short name) here.  Failing to do so
    # results code that's in the wrong package, and hence has
    # access to the wrong package filehandles.

    if (my $subref = $Cached_fatalised_sub{$class}{$sub}{$void}{$lexical}) {
        $class->_install_subs($pkg, { $name => $subref });
        return $sref;
    }

    $code = qq[
        sub$real_proto {
            local(\$", \$!) = (', ', 0);    # TODO - Why do we do this?
    ];

    # Don't have perl whine if exec fails, since we'll be handling
    # the exception now.
    $code .= "no warnings qw(exec);\n" if $call eq "CORE::exec";

    my @protos = fill_protos($proto);
    $code .= $class->_write_invocation($core, $call, $name, $void, $lexical, $sub, $sref, @protos);
    $code .= "}\n";
    warn $code if $Debug;

    # I thought that changing package was a monumental waste of
    # time for CORE subs, since they'll always be the same.  However
    # that's not the case, since they may refer to package-based
    # filehandles (eg, with open).
    #
    # There is potential to more aggressively cache core subs
    # that we know will never want to interact with package variables
    # and filehandles.

    {
        no strict 'refs'; ## no critic # to avoid: Can't use string (...) as a symbol ref ...

        my $E;

        {
            local $@;
            $code = eval("package $pkg; require Carp; $code");  ## no critic
            $E = $@;
        }

        if (not $code) {
            croak("Internal error in autodie/Fatal processing $true_name: $E");

        }
    }

    # Now we need to wrap our fatalised sub inside an itty bitty
    # closure, which can detect if we've leaked into another file.
    # Luckily, we only need to do this for lexical (autodie)
    # subs.  Fatal subs can leak all they want, it's considered
    # a "feature" (or at least backwards compatible).

    # TODO: Cache our leak guards!

    # TODO: This is pretty hairy code.  A lot more tests would
    # be really nice for this.

    my $leak_guard;

    if ($lexical) {

        $leak_guard = qq<
            package $pkg;

            sub$real_proto {

                # If we're inside a string eval, we can end up with a
                # whacky filename.  The following code allows autodie
                # to propagate correctly into string evals.

                my \$caller_level = 0;

                my \$caller;

                while ( (\$caller = (caller \$caller_level)[1]) =~ m{^\\(eval \\d+\\)\$} ) {

                    # If our filename is actually an eval, and we
                    # reach it, then go to our autodying code immediatately.

                    goto &\$code if (\$caller eq \$filename);
                    \$caller_level++;
                }

                # We're now out of the eval stack.

                # If we're called from the correct file, then use the
                # autodying code.
                goto &\$code if ((caller \$caller_level)[1] eq \$filename);

                # Oh bother, we've leaked into another file.  Call the
                # original code.  Note that \$sref may actually be a
                # reference to a Fatalised version of a core built-in.
                # That's okay, because Fatal *always* leaks between files.

                goto &\$sref if \$sref;
        >;


        # If we're here, it must have been a core subroutine called.
        # Warning: The following code may disturb some viewers.

        # TODO: It should be possible to combine this with
        # write_invocation().

        foreach my $proto (@protos) {
            local $" = ", ";    # So @args is formatted correctly.
            my ($count, @args) = @$proto;
            $leak_guard .= qq<
                if (\@_ == $count) {
                    return $call(@args);
                }
            >;
        }

        $leak_guard .= qq< Carp::croak("Internal error in Fatal/autodie.  Leak-guard failure"); } >;

        # warn "$leak_guard\n";

        my $E;
        {
            local $@;

            $leak_guard = eval $leak_guard;  ## no critic

            $E = $@;
        }

        die "Internal error in $class: Leak-guard installation failure: $E" if $E;
    }

    my $installed_sub = $leak_guard || $code;

    $class->_install_subs($pkg, { $name => $installed_sub });

    $Cached_fatalised_sub{$class}{$sub}{$void}{$lexical} = $installed_sub;

    # Cache that we've now overriddent this sub.  If we get called
    # again, we may need to find that find subroutine again (eg, for hints).

    $Is_fatalised_sub{$installed_sub} = $sref;

    return $sref;

}

# This subroutine exists primarily so that child classes can override
# it to point to their own exception class.  Doing this is significantly
# less complex than overriding throw()

sub exception_class { return "autodie::exception" };

{
    my %exception_class_for;
    my %class_loaded;

    sub throw {
        my ($class, @args) = @_;

        # Find our exception class if we need it.
        my $exception_class =
             $exception_class_for{$class} ||= $class->exception_class;

        if (not $class_loaded{$exception_class}) {
            if ($exception_class =~ /[^\w:']/) {
                confess "Bad exception class '$exception_class'.\nThe '$class->exception_class' method wants to use $exception_class\nfor exceptions, but it contains characters which are not word-characters or colons.";
            }

            # Alas, Perl does turn barewords into modules unless they're
            # actually barewords.  As such, we're left doing a string eval
            # to make sure we load our file correctly.

            my $E;

            {
                local $@;   # We can't clobber $@, it's wrong!
                eval "require $exception_class"; ## no critic
                $E = $@;    # Save $E despite ending our local.
            }

            # We need quotes around $@ to make sure it's stringified
            # while still in scope.  Without them, we run the risk of
            # $@ having been cleared by us exiting the local() block.

            confess "Failed to load '$exception_class'.\nThis may be a typo in the '$class->exception_class' method,\nor the '$exception_class' module may not exist.\n\n $E" if $E;

            $class_loaded{$exception_class}++;

        }

        return $exception_class->new(@args);
    }
}

# For some reason, dying while replacing our subs doesn't
# kill our calling program.  It simply stops the loading of
# autodie and keeps going with everything else.  The _autocroak
# sub allows us to die with a vegence.  It should *only* ever be
# used for serious internal errors, since the results of it can't
# be captured.

sub _autocroak {
    warn Carp::longmess(@_);
    exit(255);  # Ugh!
}

package autodie::Scope::Guard;

# This code schedules the cleanup of subroutines at the end of
# scope.  It's directly inspired by chocolateboy's excellent
# Scope::Guard module.

sub new {
    my ($class, $handler) = @_;

    return bless $handler, $class;
}

sub DESTROY {
    my ($self) = @_;

    $self->();
}

1;

__END__

=head1 NAME

Fatal - Replace functions with equivalents which succeed or die

=head1 SYNOPSIS

    use Fatal qw(open close);

    open(my $fh, "<", $filename);  # No need to check errors!

    use File::Copy qw(move);
    use Fatal qw(move);

    move($file1, $file2); # No need to check errors!

    sub juggle { . . . }
    Fatal->import('juggle');

=head1 BEST PRACTICE

B<Fatal has been obsoleted by the new L<autodie> pragma.> Please use
L<autodie> in preference to C<Fatal>.  L<autodie> supports lexical scoping,
throws real exception objects, and provides much nicer error messages.

The use of C<:void> with Fatal is discouraged.

=head1 DESCRIPTION

C<Fatal> provides a way to conveniently replace
functions which normally return a false value when they fail with
equivalents which raise exceptions if they are not successful.  This
lets you use these functions without having to test their return
values explicitly on each call.  Exceptions can be caught using
C<eval{}>.  See L<perlfunc> and L<perlvar> for details.

The do-or-die equivalents are set up simply by calling Fatal's
C<import> routine, passing it the names of the functions to be
replaced.  You may wrap both user-defined functions and overridable
CORE operators (except C<exec>, C<system>, C<print>, or any other
built-in that cannot be expressed via prototypes) in this way.

If the symbol C<:void> appears in the import list, then functions
named later in that import list raise an exception only when
these are called in void context--that is, when their return
values are ignored.  For example

    use Fatal qw/:void open close/;

    # properly checked, so no exception raised on error
    if (not open(my $fh, '<', '/bogotic') {
        warn "Can't open /bogotic: $!";
    }

    # not checked, so error raises an exception
    close FH;

The use of C<:void> is discouraged, as it can result in exceptions
not being thrown if you I<accidentally> call a method without
void context.  Use L<autodie> instead if you need to be able to
disable autodying/Fatal behaviour for a small block of code.

=head1 DIAGNOSTICS

=over 4

=item Bad subroutine name for Fatal: %s

You've called C<Fatal> with an argument that doesn't look like
a subroutine name, nor a switch that this version of Fatal
understands.

=item %s is not a Perl subroutine

You've asked C<Fatal> to try and replace a subroutine which does not
exist, or has not yet been defined.

=item %s is neither a builtin, nor a Perl subroutine

You've asked C<Fatal> to replace a subroutine, but it's not a Perl
built-in, and C<Fatal> couldn't find it as a regular subroutine.
It either doesn't exist or has not yet been defined.

=item Cannot make the non-overridable %s fatal

You've tried to use C<Fatal> on a Perl built-in that can't be
overridden, such as C<print> or C<system>, which means that
C<Fatal> can't help you, although some other modules might.
See the L</"SEE ALSO"> section of this documentation.

=item Internal error: %s

You've found a bug in C<Fatal>.  Please report it using
the C<perlbug> command.

=back

=head1 BUGS

C<Fatal> clobbers the context in which a function is called and always
makes it a scalar context, except when the C<:void> tag is used.
This problem does not exist in L<autodie>.

"Used only once" warnings can be generated when C<autodie> or C<Fatal>
is used with package filehandles (eg, C<FILE>).  It's strongly recommended
you use scalar filehandles instead.

=head1 AUTHOR

Original module by Lionel Cons (CERN).

Prototype updates by Ilya Zakharevich <ilya@math.ohio-state.edu>.

L<autodie> support, bugfixes, extended diagnostics, C<system>
support, and major overhauling by Paul Fenwick <pjf@perltraining.com.au>

=head1 LICENSE

This module is free software, you may distribute it under the
same terms as Perl itself.

=head1 SEE ALSO

L<autodie> for a nicer way to use lexical Fatal.

L<IPC::System::Simple> for a similar idea for calls to C<system()>
and backticks.

=cut