I recently wrote a Go func that starts off by opening a network listening connection and defers closing that connection.

connection, err := icmp.ListenPacket(...)
if err != nil {
    panic(err)
}
defer connection.Close()

The defer'd connection.Close()returns an error, but how to capture and do something with that error if it occurs?

A solution was not so obvious to me. Thankfully I stumbled upon a very comprehensive and detailed answer.A bit of overkill (for my purposes) that led me to this simple implementation.

    connection, err := icmp.ListenPacket(...)
    if err != nil {
        panic(err)
    }
    defer func() {
        err = connection.Close()
        if err != nil {
            fmt.Printf("%v\n", err)
        }
    }()

Thank you most kindly pocketgophers. Life is good.