Signed_route (http_client.Http_api.Signed

module type Signer = sig ... end

module type S = sig ... end

module Make
  (C : Signer)
  (E : sig ... end) : 
  S
    with type Request.t = E.Request.t
     and type Response.t = E.Response.t
     and type Response.Error.t = E.Response.Error.t
     and type Signer.t := C.t