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package SomePM;
use OtherPackage;

OtherPackege::some_func(); # works

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sub ::D  { require Data::Dumper; return Data::Dumper::Dumper(@_) }
sub ::DD { require Carp; Carp::confess(::D(@_)) }

# later, call it like this:
print ::D({ current_state => $state }); # debug print
::DD($state);                           # dump, stack trace, die.