Fix copy-list/mapcan bug that causes Show Class Slots to sometimes loop infinitely.
Fix copy-list/mapcan bug that causes Show Class Slots to sometimes
loop infinitely.

onixie/mcclim,swflint/McCLIM,slyrus/mcclim,slyrus/mcclim,onixie/mcclim,swflint/McCLIM,antifuchs/mcclim,antifuchs/mcclim,swflint/McCLIM,onixie/mcclim