var readCallsAtomic int32
	var closeCallsAtomic int32 // atomic
	someErr := errors.New("some body read error")
	body := issue18239Body{&readCallsAtomic, &closeCallsAtomic, someErr}

	req, err := NewRequest("POST", ts.URL, body)
	if err != nil {
		t.Fatal(err)
	}
	req = req.WithT(t)
	_, err = tr.RoundTrip(req)
	if err != someErr {
		t.Errorf("Got error: %v; want Request.Body read error: %v", err, someErr)