@escaping Diagnostics Should Always Offer a Fixit

The following code

func mapping <A, B, C> (f: (A) -> (B)) -> (((C, B) -> (C))) -> ((C, A) -> (C)) {
  return { reducer in
    return { accum, input in
      reducer(accum, f(input))
    }
  }
}

Should suggest that we insert @escaping in two places such that the final signature is

func mapping <A, B, C> (f: @escaping (A) -> (B)) -> (@escaping ((C, B) -> (C))) -> ((C, A) -> (C))

However, it only chooses to offer a fixit for the leftmost @escaping and reports the rightmost one as escaping without a fixit. We should diagnose both consistently and offer a fixit.