+val sort_metasenv: NCic.substitution -> NCic.metasenv -> NCic.metasenv
+
+type meta_kind = [ `IsSort | `IsType | `IsTerm ]
+val kind_of_meta: NCic.meta_attrs -> meta_kind
+val set_kind: meta_kind -> NCic.meta_attrs -> NCic.meta_attrs
+val replace_in_metasenv:
+ int -> (NCic.conjecture -> NCic.conjecture) -> NCic.metasenv -> NCic.metasenv
+val replace_in_subst:
+ int -> (NCic.subst_entry -> NCic.subst_entry) -> NCic.substitution ->
+ NCic.substitution
+val max_kind: meta_kind -> meta_kind -> meta_kind