为什么在下面的Go代码中不能使用空白标识符？

Question

for _, arg := range flag.Args() {
    go func() {
        path.Walk(arg, dupes, walkerrs)
        walkend <- true
    }()
}
for _ := range flag.Args() {
    if !<-walkend {
        os.Exit(1)
    }
}

The second use of _ gives this error: no new variables on left side of :=. What have I done wrong?

Answer 1

Use this line:

for _ = range flag.Args() {

The error should disappear if you omit initialization for the blank identifier.