'status * cic_term * cic_term (* status, term, type *)
val apply_subst:
#pstatus as 'status -> NCic.context -> cic_term -> 'status * cic_term
'status * cic_term * cic_term (* status, term, type *)
val apply_subst:
#pstatus as 'status -> NCic.context -> cic_term -> 'status * cic_term