Hello monks,

I'll need help with the following problem. Consider we have a class A, that inherits from class C and uses some syntax sugar as defined in B. Here's A: 

package A;
use lib '.';
use strict;
use warnings;
use B qw(moo);
use C;
use Exporter;
our @ISA = qw(C);
A-> new;
moo;
1;

[download]

Here's B: 

package B;
use strict;
use warnings;
use Exporter;
use vars qw(@ISA @EXPORT_OK);
@ISA = qw(Exporter);
@EXPORT_OK = qw(moo);
sub moo { print "B::moo\n" }
1;

[download]

and here's C: 

package C;
use strict;
use warnings;
sub new { bless({}, shift)-> moo };
sub moo { print "C::moo\n"; }
1;

[download]
all three in 3 different files, for example. Now, running that code, surprisingly for me, yields "B::moo" twice, whereas I'd expect that first time it would print "C::moo". As you can see, B::moo is being invoked instead of C::moo.

Now, the question. I understand how it works, but I don't know, if there are any good practices to protect A and C from being abused that way? It's a fairly realistic scenario if A doesn't know that C::moo exists at all, or even worse, doesn't exist today but will exist in a newer version of C. It's not uncommon to have third-party modules to export names, but is there a simple technique to import them in a safer manner?

Thank you!

In reply to Need help with clashing method names by dk

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