package Some::Module;
use strict;
use warnings;
use base qw(Exporter);
our @EXPORT_OK = qw(some_sub);
# This is an example of a subroutine that returns (undef, $msg)
# to signal failure.
sub some_sub {
my ($arg) = @_;
if ($arg) {
return (undef, "Insufficient credit");
}
return (1,2,3);
}
1;