code: func (c *Flags) Init(f *flag.FlagSet) {
  	i := os.Getenv("ISOLATE_SERVER")
  	f.StringVar(&c.ServerURL, "isolate-server", i,
  		"Isolate server to use; defaults to value of $ISOLATE_SERVER; use special value 'fake' to use a fake server")
  	f.StringVar(&c.ServerURL, "I", i, "Alias for -isolate-server")
  	f.StringVar(&c.Namespace, "namespace", DefaultNamespace, "")
  }
docs: // Init registers flags in a given flag set.