a-type="int">x</span> =&gt; <span class='ident' data-type="int => Js.Promise.t(Belt.Result.t(int, exn))">Result.Promise.return</span>(<span class='ident' data-type="int">x</span>))
  <span class='operator' data-type="(
  Js.Promise.t(Belt.Result.t(int, exn)),
  Js.Promise.t(Belt.Result.t(int, exn)) => Js.Promise.t(
    Belt.Result.t(int, exn)
  )
) => Js.Promise.t(Belt.Result.t(int, exn))">|&gt;</span> <span class='ident' data-type="(
  int => Belt.Result.t(int, exn),
  Js.Promise.t(Belt.Result.t(int, exn))