}
	return fmt.Sprintf("[FrameWriteRequest stream=%d, ch=%v, writer=%v]", wr.StreamID(), wr.done != nil, des)
}

// replyToWriter sends err to wr.done and panics if the send must block
// This does nothing if wr.done is nil.
func (wr *http2FrameWriteRequest) replyToWriter(err error) {
	if wr.done == nil {
		return
	}
	select {
	case wr.done <- err:
	default: