Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode(3pm)
                                           User Contributed Perl Documentation


NAME
       Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode -
       Don't write code after an unconditional "die, exit, or next".

AFFILIATION
       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION
       This policy prohibits code following a statement which unconditionally
       alters the program flow.  This includes calls to "exit", "die",
       "return", "next", "last" and "goto".  Due to common usage, "croak" and
       "confess" from Carp are also included.

       Code is reachable if any of the following conditions are true:

       o   Flow-altering statement has a conditional attached to it

       o   Statement is on the right side of an operator "&&", "||", "//",
           "and", "or", or "err".

       o   Code is prefixed with a label (can potentially be reached via
           "goto")

       o   Code is a subroutine

EXAMPLES
         # not ok

         exit;
         print "123\n";

         # ok

         exit if !$xyz;
         print "123\n";

         # not ok

         for ( 1 .. 10 ) {
             next;
             print 1;
         }

         # ok

         for ( 1 .. 10 ) {
             next if $_ == 5;
             print 1;
         }

         # not ok

         sub foo {
             my $bar = shift;
             return;
             print 1;
         }

         # ok

         sub foo {
             my $bar = shift;
             return if $bar->baz();
             print 1;
         }


         # not ok

         die;
         print "123\n";

         # ok

         die;
         LABEL: print "123\n";

         # not ok

         croak;
         do_something();

         # ok

         croak;
         sub do_something {}

CONFIGURATION
       This Policy is not configurable except for the standard options.

SEE ALSO
       Perl::Critic::Policy::ControlStructures::ProhibitPostfixControls

AUTHOR
       Peter Guzis <pguzis@cpan.org>

COPYRIGHT
       Copyright (c) 2006-2011 Peter Guzis.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.  The full text of this license can
       be found in the LICENSE file included with this module.

perl v5.38.0                      2023-07-26
         Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode(3pm)