reqres.go
func (r *reqResReader) arg1Reader() (ArgReader, error) {
	return r.argReader(false /* last */, reqResReaderPreArg1, reqResReaderPreArg2)
}
func (r *reqResReader) arg1Reader() (ArgReader, error) {
	return r.argReader(false /* last */, reqResReaderPreArg1, reqResReaderPreArg2)
}
// arg1Reader returns an ArgReader to read arg1.