| C.Implicit a, C.Implicit a' -> a = a'
we insert an unused variable below to genarate a warning at compile time
*)
- | _,_ -> let fix_alpha_equivalence_please = 0 in false (* we already know that t != t' *)
+ | _,_ -> false (* we already know that t != t' *)
and aux_exp_named_subst exp_named_subst1 exp_named_subst2 =
try
List.fold_left2