constant.pm is pretty crufty by now, but here's a "clean-room implementation" of the same sort of idea...
use v5.12; use warnings;
BEGIN {
package MyConstant;
$INC{'MyConstant.pm'} = __FILE__;
sub import {
my $caller = caller;
my $class = shift;
if (@_ == 1 and ref $_[0] eq 'HASH') {
while (my ($key, $value) = each %{$_[0]}) {
$class->_define($caller, $key, $value);
}
}
else {
$class->_define($caller, @_);
}
}
sub _define {
my $class = shift;
my ($caller, $name, @values) = @_;
my $code;
if (@values == 1) {
my $v = $values[0];
$code = sub () { $v };
}
else {
$code = sub () { @values };
}
no strict 'refs';
*{"$caller\::$name"} = $code;
}
}
use MyConstant {
FOO => 4,
BAR => 2,
};
say FOO . BAR;
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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