reqres.go
func (r *reqResReader) arg3Reader() (ArgReader, error) {
	return r.argReader(true /* last */, reqResReaderPreArg3, reqResReaderComplete)
}
func (r *reqResReader) arg3Reader() (ArgReader, error) {
	return r.argReader(true /* last */, reqResReaderPreArg3, reqResReaderComplete)
}
// arg3Reader returns an ArgReader to read arg3.