1Carp::Always(3)       User Contributed Perl Documentation      Carp::Always(3)
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NAME

6       Carp::Always - Warns and dies noisily with stack backtraces
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SYNOPSIS

9         use Carp::Always;
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11       Often used on the command line:
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13         perl -MCarp::Always script.pl
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DESCRIPTION

16       This module is meant as a debugging aid. It can be used to make a
17       script complain loudly with stack backtraces when warn()ing or
18       die()ing.
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20       Here are how stack backtraces produced by this module looks:
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22         # it works for explicit die's and warn's
23         $ perl -MCarp::Always -e 'sub f { die "arghh" }; sub g { f }; g'
24         arghh at -e line 1
25                 main::f() called at -e line 1
26                 main::g() called at -e line 1
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28         # it works for interpreter-thrown failures
29         $ perl -MCarp::Always -w -e 'sub f { $a = shift; @a = @$a };' \
30                                  -e 'sub g { f(undef) }; g'
31         Use of uninitialized value in array dereference at -e line 1
32                 main::f('undef') called at -e line 2
33                 main::g() called at -e line 2
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35       In the implementation, the Carp module does the heavy work, through
36       "longmess()". The actual implementation sets the signal hooks
37       $SIG{__WARN__} and $SIG{__DIE__} to emit the stack backtraces.
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39       Also, all uses of "carp" and "croak" are made verbose, behaving like
40       "cluck" and "confess".
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METHODS

43       Carp::Always implements the following methods.
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45   import
46         Carp::Always->import()
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48       Enables Carp::Always. Also triggered by statements like
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50         use Carp::Always;
51         use Carp::Always 0.14;
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53       but not by
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55         use Carp::Always ();    # does not invoke import()
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57   unimport
58         Carp::Always->unimport();
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60       Disables Carp::Always. Also triggered with
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62         no Carp::Always;
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ACKNOWLEDGMENTS

65       This module was born as a reaction to a release of Acme::JavaTrace by
66       Sébastien Aperghis-Tramoni.  Sébastien also has a newer module called
67       Devel::SimpleTrace with the same code and fewer flame comments on docs.
68       The pruning of the uselessly long docs of this module was prodded by
69       Michael Schwern.
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71       Schwern and others told me "the module name stinked" - it was called
72       "Carp::Indeed". After thinking long and getting nowhere, I went with
73       nuffin's suggestion and now it is called "Carp::Always".
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SEE ALSO

76       Carp
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78       Acme::JavaTrace and Devel::SimpleTrace
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80       Carp::Always::Color
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82       Carp::Source::Always
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84       Devel::Confess
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86       Carp::Always::SyntaxHighlightSource and Carp::Always::DieOnly
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BUGS

89       •   This module does not play well with other modules which fusses
90           around with "warn", "die", $SIG{__WARN__}, $SIG{__DIE__}.
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92       •   Test scripts are good. I should write more of these.
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94       Please report bugs via GitHub
95       <https://github.com/aferreira/cpan-Carp-Always/issues>
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97       Backlog in CPAN RT:
98       <https://rt.cpan.org/Public/Dist/Display.html?Name=Carp-Always>
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AUTHOR

101       Adriano Ferreira, <ferreira@cpan.org>
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104       Copyright (C) 2005-2013, 2018 by Adriano Ferreira
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106       This library is free software; you can redistribute it and/or modify it
107       under the same terms as Perl itself.
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111perl v5.34.0                      2021-07-22                   Carp::Always(3)
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