message: remove useless var
diff: @@ -57,7 +57,7 @@ export class MemoMap {
  return T.succeedNow(tuple(cached, m))
  } else {
  - const x = pipe(
  + return pipe(
  T.of,
  T.bind("observers", () => R.makeRef(0)),
  T.bind("promise", () => P.make<E, A>()),
  @@ -177,7 +177,6 @@ export class MemoMap {
  )
  )
  )
  - return x
  }
  }),
  T.flatten
  