I have a superclass (MyClass), which creates instances of a subclass on demand. MyClass implements a custom method "get_subclass_instance" for this. The subclass (SubClass) extends 'MyClass';, however, this generates a "Subroutine get_subclass_instance redefined" warning.

Minimal example:

# MyClass.pm
package MyClass;
use SubClass;
use Moose;

sub get_subclass_object {
    return SubClass->new;
}

1;
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# SubClass.pm
package SubClass;
use Moose;

extends 'MyClass';

1;
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$ perl -MMyClass -e 0
Subroutine get_subclass_object redefined at MyClass.pm line 5.

$
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I understand that extends(...) tries to load the class(es) passed to it. Consequently, if I remove the Extends 'MyClass' line from SubClass.pm, the warning disappears.
But I don't want to remove that line, because SubClass does extend MyClass!

Of course, I could simply ignore the warning, but that doesn't feel clean to me. So what am I doing wrong, and how can I have MyClass load and instantiate SubClass, while SubClass explicitly extends MyClass?