toFn := func(name string) (func([]byte, string) []byte, func([]byte, []byte) []byte) {
		switch name {
		case "Trim":
			return Trim, nil
		case "TrimLeft":
			return TrimLeft, nil
		case "TrimRight":
			return TrimRight, nil
		case "TrimPrefix":
			return nil, TrimPrefix
		case "TrimSuffix":
			return nil, TrimSuffix
		default:
			t.Errorf("Undefined trim function %s", name)

		case 1:
			t.Go = c.uint8
		case 2:
			t.Go = c.uint16
		case 4:
			t.Go = c.uint32
		case 8:
			t.Go = c.uint64
		case 1 + signedDelta:
			t.Go = c.int8
		case 2 + signedDelta:
			t.Go = c.int16
		case 4 + signedDelta:
			t.Go = c.int32
		case 8 + signedDelta:
			t.Go = c.int64
		}

	case *dwarf.FloatType:
		switch t.Size {

	r := NewReader(z)

	c := make(chan error)
	go func() {
		_, err := r.ReadByte()
		c <- err
	}()

	select {
	case err := <-c:
		if err == nil {
			t.Error("error expected")
		} else if err != io.ErrNoProgress {
			t.Error("unexpected error:", err)
		}
	case <-time.After(time.Second):
		t.Error("test timed out (endless loop in ReadByte?)")
	}
}