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.IX Title "Perl::Critic::Policy::TestingAndDebugging::RequireUseWarnings 3pm"
.TH Perl::Critic::Policy::TestingAndDebugging::RequireUseWarnings 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::TestingAndDebugging::RequireUseWarnings \- Always "use warnings".
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Using warnings, and paying attention to what they say, is probably the
single most effective way to improve the quality of your code.  This
policy requires that the \f(CW\*(Aquse warnings\*(Aq\fR statement must come before
any other statements except \f(CW\*(C`package\*(C'\fR, \f(CW\*(C`require\*(C'\fR, and other \f(CW\*(C`use\*(C'\fR
statements.  Thus, all the code in the entire package will be
affected.
.PP
There are special exemptions for Moose,
Moose::Role, and
Moose::Util::TypeConstraints because
they enforces warnings; e.g.  \f(CW\*(Aquse Moose\*(Aq\fR is treated as
equivalent to \f(CW\*(Aquse warnings\*(Aq\fR.
.PP
This policy will not complain if the file explicitly states that it is
compatible with a version of perl prior to 5.6 via an include
statement, e.g. by having \f(CW\*(C`require 5.005\*(C'\fR in it.
.PP
The maximum number of violations per document for this policy defaults
to 1.
.SH CONFIGURATION
.IX Header "CONFIGURATION"
If you make use of things like
Moose::Exporter, you can create your own modules
that import the warnings pragma into the code that is
\&\f(CW\*(C`use\*(C'\fRing them.  There is an option to add to the default set of
pragmata and modules in your \fI.perlcriticrc\fR: \f(CW\*(C`equivalent_modules\*(C'\fR.
.PP
.Vb 2
\&    [TestingAndDebugging::RequireUseWarnings]
\&    equivalent_modules = MooseX::My::Sugar
.Ve
.SH BUGS
.IX Header "BUGS"
Needs to check for \-w on the shebang line.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic::Policy::TestingAndDebugging::ProhibitNoWarnings
.SH AUTHOR
.IX Header "AUTHOR"
Jeffrey Ryan Thalhammer <jeff@imaginative\-software.com>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2005\-2011 Imaginative Software Systems.  All rights reserved.
.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