-(*
-exception AssertFailure of string Lazy.t
-exception DeliftingARelWouldCaptureAFreeVariable;;
-val apply_subst : Cic.substitution -> Cic.term -> Cic.term
-val apply_subst_context : Cic.substitution -> Cic.context -> Cic.context
-val apply_subst_metasenv: Cic.substitution -> Cic.metasenv -> Cic.metasenv
-
-(*** delifting ***)