:l ../shell.hs
:def shell (\s -> do shell s; return "")

:set prompt ""
:set -v1

:shell echo "module Ghci058 where c = 'a'" > Ghci058.hs
:shell "$HC" $HC_OPTS $ghciWayFlags -fforce-recomp -c Ghci058.hs
:l Ghci058
c

:shell echo "module Ghci058 where c = 'b'" > Ghci058.hs
:shell "$HC" $HC_OPTS $ghciWayFlags -fforce-recomp -c Ghci058.hs
:l Ghci058
c