copy(t.cap, cap)
		}
		d.t = t
		t = nil
	}
	return t
}

type onePassMachine struct {
	inputs   inputs
	matchcap []int
}

var onePassPool sync.Pool

func newOnePassMachine() *onePassMachine {
	m, ok := onePassPool.Get().(*onePassMachine)
	if !ok {
		m = new(onePassMachine)
	}
	return m
}

func freeOnePassMachine(m *onePassMachine) {
	m.inputs.clear()