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Can't use wildcard as implicit argument and/or error message requires improvement #49

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Kakadu opened this issue Mar 11, 2016 · 0 comments

Kakadu commented Mar 11, 2016

module type MONAD = sig
  type 'a t
  val return : 'a -> 'a t
  val bind : ('a -> 'b t) -> 'a t -> 'b t
end

let foo : {X: MONAD} -> string X.t -> unit = fun _ s -> ()
(* Error: This function should have type {X : MONAD} -> person X.t -> unit
       but its first argument is not labelled
*)

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