func (x *Float) Append(buf []byte, fmt byte, prec int) []byte {
	// sign
	if x.neg {
		buf = append(buf, '-')
	}

	// Inf
	if x.form == inf {
		if !x.neg {
			buf = append(buf, '+')
		}
		return append(buf, "Inf"...)
	}

	// pick off easy formats
	switch fmt {
	case 'b':
		return x.fmtB(buf)
	case 'p':
		return x.fmtP(buf)
	case 'x':
		return x.fmtX(buf, prec)
	}

	// Algorithm:

		mant |= uint64(1) << flt.mantbits
	}
	exp += flt.bias

	// Pick off easy binary, hex formats.
	if fmt == 'b' {
		return fmtB(dst, neg, mant, exp, flt)
	}
	if fmt == 'x' || fmt == 'X' {
		return fmtX(dst, prec, fmt, neg, mant, exp, flt)
	}

	if !optimize {
		return bigFtoa(dst, prec, fmt, neg, mant, exp, flt)
	}

	var digs decimalSlice
	ok := false

		fmt.Fprint(s, "[")
		if n.Low != nil {
			fmt.Fprint(s, n.Low)
		}
		fmt.Fprint(s, ":")
		if n.High != nil {
			fmt.Fprint(s, n.High)
		}
		if n.Op().IsSlice3() {
			fmt.Fprint(s, ":")
			if n.Max != nil {
				fmt.Fprint(s, n.Max)
			}
		}
		fmt.Fprint(s, "]")

	case OSLICEHEADER:
		n := n.(*SliceHeaderExpr)
		fmt.Fprintf(s, "sliceheader{%v,%v,%v}", n.Ptr, n.Len, n.Cap)

//	%S	Short syntax: Name only, no matter what.
func (s *Sym) Format(f fmt.State, verb rune) {
	mode := fmtGo
	switch verb {
	case 'v', 'S':
		if verb == 'v' && f.Flag('+') {
			mode = fmtDebug
		}
		fmt.Fprint(f, sconv(s, verb, mode))

	default:
		fmt.Fprintf(f, "%%!%c(*types.Sym=%p)", verb, s)
	}
}

func (s *Sym) String() string {
	return sconv(s, 0, fmtGo)
}

		}
	}
	return b
}

// fmtS formats a string.
func (f *fmt) fmtS(s string) {
	s = f.truncateString(s)
	f.padString(s)
}

// fmtBs formats the byte slice b as if it was formatted as string with fmtS.
func (f *fmt) fmtBs(b []byte) {
	b = f.truncate(b)
	f.pad(b)
}

// fmtSbx formats a string or byte slice as a hexadecimal encoding of its bytes.
func (f *fmt) fmtSbx(s string, b []byte, digits string) {

	case 'v':
		if p.fmt.sharpV {
			p.fmt.fmtQ(v)
		} else {
			p.fmt.fmtS(v)
		}
	case 's':
		p.fmt.fmtS(v)
	case 'x':
		p.fmt.fmtSx(v, ldigits)
	case 'X':
		p.fmt.fmtSx(v, udigits)
	case 'q':
		p.fmt.fmtQ(v)
	default:
		p.badVerb(verb)
	}
}

func (p *pp) fmtBytes(v []byte, verb rune, typeString string) {
	switch verb {
	case 'v', 'd':
		if p.fmt.sharpV {

		// integer types, and uint8Pair_t.
		cTypes[i] = t.In(i).Name() + "_t"
		if t.In(i).Name() == "uint8Pair" {
			cArgs[i] = fmt.Sprintf("(uint8Pair_t){%d,1}", i)
		} else {
			cArgs[i] = fmt.Sprintf("%d", i+1)
		}
	}
	fmt.Fprintf(w, `
typedef uintptr_t %s (*%s)(%s);
uintptr_t %s(%s f) {
	return f(%s);
}

	// test len
	if len(mib) != count {
		panic(fmt.Sprintf("len(mib) = %d\n", len(mib)))
	}
	if len(mii) != count {
		panic(fmt.Sprintf("len(mii) = %d\n", len(mii)))
	}
	if len(mfi) != count {
		panic(fmt.Sprintf("len(mfi) = %d\n", len(mfi)))
	}
	if len(mif) != count {
		panic(fmt.Sprintf("len(mif) = %d\n", len(mif)))
	}
	if len(msi) != count {
		panic(fmt.Sprintf("len(msi) = %d\n", len(msi)))
	}

	fmt.Println(a.Split("banana", 1))
	fmt.Println(a.Split("banana", 2))
	zp := regexp.MustCompile(`z+`)
	fmt.Println(zp.Split("pizza", -1))
	fmt.Println(zp.Split("pizza", 0))
	fmt.Println(zp.Split("pizza", 1))
	fmt.Println(zp.Split("pizza", 2))
	// Output:
	// [b n n ]
	// []
	// [banana]
	// [b nana]
	// [pi a]
	// []
	// [pizza]
	// [pi a]
}

func ExampleRegexp_Expand() {

			nil,
		},
		{
			aggregate{fmt.Errorf("abc")},
			aggregate{fmt.Errorf("abc")},
		},
		{
			aggregate{fmt.Errorf("abc"), fmt.Errorf("def"), fmt.Errorf("ghi")},
			aggregate{fmt.Errorf("abc"), fmt.Errorf("def"), fmt.Errorf("ghi")},
		},
		{
			aggregate{aggregate{fmt.Errorf("abc")}},
			aggregate{fmt.Errorf("abc")},
		},
		{
			aggregate{aggregate{aggregate{fmt.Errorf("abc")}}},