span class='ident' data-type="int => Js.Promise.t(int)">Js.Promise.resolve</span>(<span class='int' data-type="int">20</span>)
  <span class='operator' data-type="(
  Js.Promise.t(int),
  Js.Promise.t(int) => Js.Promise.t(
    Belt.Result.t(int, exn)
  )
) => Js.Promise.t(Belt.Result.t(int, exn))">|&gt;</span> <span class='ident' data-type="(
  int => Js.Promise.t(Belt.Result.t(int, exn)),
  Js.Promise.t(int)
) => Js.Promise.t(Belt.Result.t(int, exn))">Js.Promise.then_</span>(<span class='pattern-ident' dat