The thought has passed my mind briefly, I think, but I rejected it because I do want to be able to just use MyClass; and automatically have SubClass available.

However, it turns out you're right: if I move use SubClass out of MyClass.pm it just works fine. So I've come up with this workaround:

• Have one wrapper package which loads all classes and subclasses
  (so that the script useing MyClass only needs one use statement to have it all)
• Make it so that the wrapper package inherits all methods from the base class
  (so that all methods on the base class work when called on the wrapper package)
• Have the base class as before, but without it useing its subclass, and now named 'BaseClass'
• Have the subclass as before, but with extends 'BaseClass' instead.

# MyClass.pm
package MyClass;
use BaseClass;   # load the base class
use SubClass;    # load the sub class (which now extends BaseClass)

our @ISA = qw(BaseClass); # have all BaseClass methods work on MyClass
1;
[download]

# BaseClass.pm
package BaseClass;
use Moose;

sub get_subclass_object {
    return SubClass->new;
}
1;
[download]

# SubClass.pm
package SubClass;
use Moose;

extends 'BaseClass';

1;
[download]

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