normalize_machine status ~delta ~subst ctx
(fst (NCicReduction.reduce_machine status ~delta ~subst ctx (0,[],t,[])))
and normalize_machine status ?(delta=0) ~subst ctx (k,e,t,s) =
normalize_machine status ~delta ~subst ctx
(fst (NCicReduction.reduce_machine status ~delta ~subst ctx (0,[],t,[])))
and normalize_machine status ?(delta=0) ~subst ctx (k,e,t,s) =