Module Type_class.S2

module S2: sig .. end

type ('a, 'b, 'c) writer = 'a Type_class.writer0 -> ('b, 'c) Type_class.S1.writer 
type ('a, 'b, 'c) reader = 'a Type_class.reader0 -> ('b, 'c) Type_class.S1.reader 
type ('a, 'b, 'c) t = 'a Type_class.t0 -> ('b, 'c) Type_class.S1.t