type http2clientConnReadLoop struct {
	_  http2incomparable
	cc *http2ClientConn
}

// readLoop runs in its own goroutine and reads and dispatches frames.
func (cc *http2ClientConn) readLoop() {
	cc.t.markNewGoroutine()
	rl := &http2clientConnReadLoop{cc: cc}
	defer rl.cleanup()
	cc.readerErr = rl.run()