+
+(* subst_vars exp_named_subst t2 *)
+(* applies [exp_named_subst] to [t2] *)
+val subst_vars :
+ Cic.term Cic.explicit_named_substitution -> Cic.term -> Cic.term
+
+(* TODO CSC rename to subst_meta *)
+
+(* lift_meta [t_1 ; ... ; t_n] t *)
+(* returns the term [t] where [Rel i] is substituted with [t_i] *)
+(* [t_i] is lifted as usual when it crosses an abstraction *)