Aside from the obvious fact that you don't need a recursive routine to do a fibonacci sequence, I'm still wondering why anonymous subs would ever be preferable to named subs. Is there a measurable speed increase when calling a sub through a pointer rather than a name? Why not just do:

sub fibo {
   my $inp = shift;
   $inp > 2 ? &fibo($inp - 1) + &fibo($inp - 2) : 1
}
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(for the sake of simplicity, this has been coded so that the nth term IS the nth term)

1) 1
2) 1
3) 2
4) 3