Thank you very much for reveal my confusion. I corrected my post accordingly. To perlify your example: 
sub curriable_add {
    my ($first, $second) = @_;
    croak "first argument is undefined" if !defined $first;
    return $first + $second if defined $second;
    return sub { $first + shift };
}

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In reply to Re^2: [RFC: Cool Uses for Perl] Heavy currying: weighted randomized word generator for conlangers by flowdy
in thread [RFC: Cool Uses for Perl] A weighted randomized word generator for conlangers by flowdy

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