package main

import (
    "fmt"
    "net"
)

func main() {
    runClient()
    modifyAddrs("localhost")
    runClient()
}

func modifyAddrs(host string) []string {
    addrs, err := net.LookupHost(host)
    if err != nil {
            panic(err)
    }
    for i := range addrs {
            addrs[i] += "junk"
    }
    return addrs
}

func runClient() {
    _, err := net.Dial("tcp", "localhost:23000")
    fmt.Printf("err = %v\n", err)
}

err = dial tcp 127.0.0.1:23000: getsockopt: connection refused
err = dial tcp: lookup localhost on 169.254.169.254:53: no such host