sep := []byte("hello")
	for i := 0; i < b.N; i++ {
		SplitN(benchInputHard, sep, 10)
	}
}

func BenchmarkRepeat(b *testing.B) {
	for i := 0; i < b.N; i++ {
		Repeat([]byte("-"), 80)
	}
}

func BenchmarkRepeatLarge(b *testing.B) {
	s := Repeat([]byte("@"), 8*1024)
	for j := 8; j <= 30; j++ {
		for _, k := range []int{1, 16, 4097} {
			s := s[:k]
			n := (1 << j) / k

func stack72()   { var buf [72]byte; use(buf[:]); C.callGoStackCheck() }
func stack76()   { var buf [76]byte; use(buf[:]); C.callGoStackCheck() }
func stack80()   { var buf [80]byte; use(buf[:]); C.callGoStackCheck() }
func stack84()   { var buf [84]byte; use(buf[:]); C.callGoStackCheck() }
func stack88()   { var buf [88]byte; use(buf[:]); C.callGoStackCheck() }

		input:    makeInput(FormatGNU, "1234", "fewa"),
		wantSize: 01234,
		wantErr:  ErrHeader,
	}, {
		input:    makeInput(FormatGNU, "0031"),
		wantSize: 031,
	}, {
		input:   makeInput(FormatGNU, "80"),
		wantErr: ErrHeader,
	}, {
		input: makeInput(FormatGNU, "1234",
			makeSparseStrings(sparseDatas{{0, 0}, {1, 1}})...),
		wantMap:  sparseDatas{{0, 0}, {1, 1}},
		wantSize: 01234,
	}, {