-(* fo_unif_subst metasenv subst context t1 t2 *)
-(* unifies [t1] and [t2] in a context [context] *)
-(* and with [subst] as the current substitution *)
-(* (i.e. unifies ([subst] [t1]) and *)
-(* ([subst] [t2]) in a context *)
-(* ([subst] [context]) using the metasenv *)
-(* ([subst] [metasenv]) *)
-(* Only the metavariables declared in [metasenv] *)
-(* can be used in [t1] and [t2]. *)
-(* [subst] and the substitution returned are not *)
-(* unwinded. *)
-(*CSC: fare un tipo unione Unwinded o ToUnwind e fare gestire la
- cosa all'apply_subst!!!*)
-val fo_unif_subst :
- Cic.substitution -> Cic.context -> Cic.metasenv ->
- Cic.term -> Cic.term -> CicUniv.universe_graph ->
- Cic.substitution * Cic.metasenv * CicUniv.universe_graph