package main

import (
    "net"
    "fmt"
    "golang.org/x/net/ipv4"
)

func main() {
    conn, err := net.ListenPacket("udp4", "0.0.0.0:5004")
    if err != nil {
        fmt.Printf("ListenError: %s\n", err)
        return
    }
    pconn := ipv4.NewPacketConn(conn)
    if err = pconn.SetControlMessage(ipv4.FlagDst, true); err != nil {
        fmt.Printf("Set control error: %s\n", err)
        return
    }

    fmt.Printf("Complete\n")
}

panic: reflect: call of reflect.Value.Int on zero Value

goroutine 1 [running]:
reflect.Value.Int(0x0, 0x0, 0x0, 0x5240c4)
	/usr/local/go/src/reflect/value.go:914 +0x141
golang.org/x/net/ipv4.sysfd(0x5b9640, 0xc42000e030, 0xc42000e030, 0x5b9640, 0xc42000e030)
	/home/ufm/src/gocode/src/golang.org/x/net/ipv4/helper_unix.go:46 +0x196
golang.org/x/net/ipv4.(*payloadHandler).sysfd(0xc42007e160, 0x5b9640, 0xc42000e030, 0xc42007e140)
	/home/ufm/src/gocode/src/golang.org/x/net/ipv4/helper_unix.go:31 +0x5b
golang.org/x/net/ipv4.(*PacketConn).SetControlMessage(0xc42007e140, 0x4, 0xc42007e101, 0xc, 0x5b93a0)
	/home/ufm/src/gocode/src/golang.org/x/net/ipv4/endpoint.go:55 +0x4c
main.main()
	/home/ufm/src/master/src/2/some.go:16 +0xf3

ufm@vbu2 ~/src/master/src/2 $ ./some185
Complete