circular::require - detect circularity in use/require statements
package Foo; use Bar; package Bar; use Foo; package main; no circular::require; use Foo; # warns
perl -M-circular::require foo.pl
Perl by default just ignores cycles in require statements - if Foo.pm does
use Bar and Bar.pm does
use Foo, doing
use Foo elsewhere will start loading Foo.pm, then hit the
use statement, start loading Bar.pm, hit the
use statement, notice that Foo.pm has already started loading and ignore it, and continue loading Bar.pm. But Foo.pm hasn't finished loading yet, so if Bar.pm uses anything from Foo.pm (which it likely does, if it's loading it), those won't be accessible while the body of Bar.pm is being executed. This can lead to some very confusing errors, especially if introspection is happening at load time (
make_immutable in Moose classes, for example). This module generates a warning whenever a module is skipped due to being loaded, if that module has not finished executing.
This module works by overriding
CORE::GLOBAL::require, and so other modules which do this may cause issues if they aren't written properly. This also means that the effect is global, but this is typically the most useful usage.
No known bugs.
Please report any bugs through RT: email
bug-circular-require at rt.cpan.org, or browse to http://rt.cpan.org/NoAuth/ReportBug.html?Queue=circular-require.
You can find this documentation for this module with the perldoc command.
You can also look for information at:
AnnoCPAN: Annotated CPAN documentation
RT: CPAN's request tracker
Jesse Luehrs <doy at tozt dot net>
This software is copyright (c) 2011 by Jesse Luehrs.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.