I would like to avoid qualification with package name a variable that I use in many modules in many situations. For example, variable debug.

Looks like I can't use our declaration for this purpose (see below) Does any other mechanism exist?

Also question about 'export" behavior". If I export variable debug from module A does it became "normal variable" in main:: so that I can use it in module B? what will happen if I export it from module b as well ? It should bind it to the same variable, right?

Can anybody enlighten me about this behavior? BTW does Perl have a system variable "debug" that is global and does not need qualification with the package name?

For example, if I created module example.pm it compiles OK, but produces a run time error because Perl assumes that our debug is $example::debug not $main::debug

May be our behavior can be generalized to handle this case as well? Why we can't alias variables in other namespaces? Is not this an artificial restriction?

package example;
use v5.10;
   use warnings;
   use strict 'subs';
   use feature 'state';

require Exporter;

our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
@ISA = qw(Exporter);
$::debug=1;
{
our $debug;
   say "debug=$debug";
}
$VERSION = '1.10';
1;

and the test script:

<code>
#!/usr/bin/perl
#:: test of ours

   use v5.10;
   use warnings;
   use strict 'subs';
   use feature 'state';
   use lib '.';
   use example;

   say "debug=$debug";
[download]

It complains that it is undefined:

[255]  # perl test_our_behaviour.pl
<code>
[0]  # perl test_our_behaviour.pl
Use of uninitialized value $example::debug in concatenation (.) or str
+ing at example.pm line 14.
IN EXAMPLE: debug=
debug=1
[download]