---
name: "Perl::Critic::Policy::ValuesAndExpressions::ProhibitConstantPragma"
section: "3pm"
platform: "linux"
package: "perl-perl-critic"
version: "1.156-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Perl::Critic::Policy::ValuesAndExpressions::ProhibitConstantPragma"
---

# Perl::Critic::Policy::ValuesAndExpressions::ProhibitConstantPragma(3pm)

Don't "use constant FOO =\> 15".

## NAME

Perl::Critic::Policy::ValuesAndExpressions::ProhibitConstantPragma - Don't "use constant FOO =\> 15".

## AFFILIATION

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

## DESCRIPTION

Named constants are a good thing.  But don't use the `"constant"` pragma because barewords don't interpolate.  Instead use the Readonly module.

```
  use constant FOOBAR => 42;  #not ok
  use Readonly;
  Readonly my $FOOBAR => 42;  #ok
  Readonly::Scalar my $FOOBAR => 42;  #ok
```

## CONFIGURATION

This Policy is not configurable except for the standard options.

## AUTHOR

Jeffrey Ryan Thalhammer \<jeff@imaginative-software.com\>

## COPYRIGHT

Copyright (c) 2005-2011 Imaginative Software Systems.  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.