| C.Var (uri,exp_named_subst) ->
let exp_named_subst' = aux_exp_named_subst n exp_named_subst in
C.Var (uri,exp_named_subst')
| C.Var (uri,exp_named_subst) ->
let exp_named_subst' = aux_exp_named_subst n exp_named_subst in
C.Var (uri,exp_named_subst')