isInterestingArg env _ = False
foldl_fun env (TypeArg ty1:TypeArg ty2:ValArg arg_k:ValArg arg_z:ValArg arg_list:rest_args)
- | do_fb_red && isNilForm env arg_list
+ | do_fb_red && isNilForm env arg_list
= -- foldl f z [] = z
-- again another short cut, helps with unroling of constant lists
tick Foldr_Nil `thenSmpl_`