EConstr.EInstancetype t = Evd.einstanceType of universe instances up-to universe unification. Similar to ESorts.t for UVars.Instance.t.
val make : UVars.Instance.t -> tval kind : Evd.evar_map -> t -> UVars.Instance.tval equal : Evd.evar_map -> t -> t -> boolval empty : tval is_empty : t -> boolval length : t -> int * int