switch network {
	case "udp", "udp4", "udp6":
	default:
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	if raddr == nil {
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
	}
	sd := &sysDialer{network: network, address: raddr.String()}

// BUG(mikio): On Windows, the File method of IPConn is not
// implemented.

// IPAddr represents the address of an IP end point.
type IPAddr struct {
	IP   IP
	Zone string // IPv6 scoped addressing zone
}

// Network returns the address's network name, "ip".
func (a *IPAddr) Network() string { return "ip" }

func (a *IPAddr) String() string {
	if a == nil {
		return "<nil>"
	}
	ip := ipEmptyString(a.IP)

			Valu("start", OpInitMem, types.TypeMem, 0, nil),
			Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil),
			Valu("v", OpConstBool, c.config.Types.Bool, 1, nil),
			Valu("addr1", OpAddr, ptrType, 0, nil, "sb"),
			Valu("addr2", OpAddr, ptrType, 0, nil, "sb"),
			Valu("addr3", OpAddr, ptrType, 0, nil, "sb"),
			Valu("zero1", OpZero, types.TypeMem, 1, c.config.Types.Bool, "addr3", "start"),

	default:
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	sd := &sysDialer{network: network, address: raddr.String()}
	c, err := sd.dialUnix(context.Background(), laddr, raddr)
	if err != nil {
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
	}
	return c, nil
}

			Valu("start", OpInitMem, types.TypeMem, 0, nil),
			Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil),
			Valu("sp", OpSP, c.config.Types.Uintptr, 0, nil),
			Valu("v", OpConstNil, ptrType, 0, nil),
			Valu("addr1", OpAddr, ptrType, 0, nil, "sb"),
			Valu("wb2", OpStore, types.TypeMem, 0, ptrType, "addr1", "v", "wb1"),
			Valu("wb1", OpStore, types.TypeMem, 0, ptrType, "addr1", "v", "start"), // wb1 and wb2 are out of order
			Goto("exit")),

		blocs = append(blocs, Bloc(blockn(i),
			Valu(valn("v", i, 0), OpConstBool, types.Types[types.TBOOL], 1, nil),
			Valu(valn("addr", i, 1), OpAddr, ptrType, 0, nil, "sb"),
			Valu(valn("addr", i, 2), OpAddr, ptrType, 0, nil, "sb"),
			Valu(valn("addr", i, 3), OpAddr, ptrType, 0, nil, "sb"),
			Valu(valn("zero", i, 1), OpZero, types.TypeMem, 8, elemType, valn("addr", i, 3),
				valn("store", i-1, 4)),

	switch network {
	case "tcp", "tcp4", "tcp6":
	default:
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	if raddr == nil {
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
	}
	sd := &sysDialer{network: network, address: raddr.String()}

			Valu("sp", OpSP, c.config.Types.Uintptr, 0, nil),
			Valu("sb1", OpSB, c.config.Types.Uintptr, 0, nil),
			Valu("sb2", OpSB, c.config.Types.Uintptr, 0, nil),
			Valu("addr1", OpAddr, c.config.Types.Int64.PtrTo(), 0, nil, "sb1"),
			Valu("addr2", OpAddr, c.config.Types.Int64.PtrTo(), 0, nil, "sb2"),
			Valu("a1ld", OpLoad, c.config.Types.Int64, 0, nil, "addr1", "start"),
			Valu("a2ld", OpLoad, c.config.Types.Int64, 0, nil, "addr2", "start"),

					Valu("start", OpInitMem, types.TypeMem, 0, nil),
					Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil),
					Valu("const1", OpConst32, intType, 1, nil),
					Valu("const2", OpConst32, intType, 2, nil),
					Valu("addr", OpAddr, boolType.PtrTo(), 0, nil, "sb"),
					Valu("cond", OpLoad, boolType, 0, nil, "addr", "start"),
					If("cond", "b2", "b3")),
				Bloc("b2",
					Goto("b3")),
				Bloc("b3",

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Triggers a bug in writebarrier, which inserts one
// between (first block) OpAddr x and (second block) a VarDef x,
// which are then in the wrong order and unable to be
// properly scheduled.

package q

var S interface{}

func F(n int) {
	fun := func(x int) int {
		S = 1
		return n