module type S_binable = S0_binable with type ('a, 'b) set := ('a, 'b) t with type ('a, 'b) tree := ('a, 'b) Tree.t
S0_binable
with type ('a, 'b) set := ('a, 'b) t
with type ('a, 'b) tree := ('a, 'b) Tree.t