It's not a problem from perl's perspective, but behaviour in the case of circular requires can sometimes be a little unintuitive:
# foo.pm
package foo;
use bar;
sub import { printf("%s loaded foo\n", scalar caller) }
1;
# bar.pm
package bar;
use foo;
sub import { printf("%s loaded bar\n", scalar caller) }
1;
# script.pl
use foo;
Running the script, generates the following output:
foo loaded bar
main loaded foo
Did you expect to see bar loaded foo somewhere in that output?
With careful consideration of compile time versus runtime, etc, etc, you'll realise why that line was not output, and that this is proper and documented behaviour. Just not necessarily very intuitive.
use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name
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