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.IX Title "Perl::Critic::Policy::Variables::ProhibitUnusedVariables 3pm"
.TH Perl::Critic::Policy::Variables::ProhibitUnusedVariables 3pm 2025-12-14 "perl v5.42.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::Variables::ProhibitUnusedVariables \- Don\*(Aqt ask for storage you don\*(Aqt need.
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Unused variables clutter code and require the reader to do mental
bookkeeping to figure out if the variable is actually used or not.
.PP
At present, this Policy is very limited in order to ensure that there
aren\*(Aqt any false positives.  Hopefully, this will become more
sophisticated soon.
.PP
Right now, this only looks for simply declared, uninitialized lexical
variables.
.PP
.Vb 4
\&    my $x;          # not ok, assuming no other appearances.
\&    my @y = ();     # ok, not handled yet.
\&    our $z;         # ok, global.
\&    local $w;       # ok, global.
.Ve
.PP
This module is very dumb: it does no scoping detection, i.e. if the
same variable name is used in two different locations, even if they
aren\*(Aqt the same variable, this Policy won\*(Aqt complain.
.PP
Have to start somewhere.
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH AUTHOR
.IX Header "AUTHOR"
Elliot Shank \f(CW\*(C`<perl@galumph.com>\*(C'\fR
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2008\-2021 Elliot Shank.
.PP
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.