On 11 October 2011 21:11, Bas van Dijk <v.dijk.bas at gmail.com> wrote: > Note that the program also builds fine when I change the 'f' and 'z' to: > > f = flip (:) > z = [] > Oops, I meant to say: Note that the program also builds fine when I change the 'f' and 'z' to: f = (+) z = 0