I know of Schwern's Sex, but what the two modules do is different.

My Merge creates a package whose @ISA is a list I specify.

Sex creates a package by mixing up symbol table entries, both subs and variables, and (by the way) pushing the "parents" into the "child"'s @ISA.

My first solution was a simplification of Sex (with less error checking, no schwernian messages, and no randomness), but it creates problem with classes, and makes it impossible to use NEXT to add functionality to a method, in something like:

package a;
sub method {
 my $self=shift;
 # do something
}

package b;
use NEXT;
sub method {
 my $self=shift;
 # do something before
 $self->NEXT::method(@_); # do the normal stuff
 # do something after
}

package main;
require a;require b;
use Merge qw(b a)=>'c';

$c=new c;$c->method; # will call "b"'s implemetation, which will call 
+"a"'s via NEXT
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