解决 Go 语言中空白标识符重复赋值问题

for _, arg := range flag.Args() {
    go func() {
        // ...
    }()
}
for _ := range flag.Args() {
    // ...
}

for _, arg := range flag.Args() {
    go func() {
        // ...
    }()
}
for _ = range flag.Args() {
    // ...
}

package main

import (
    "flag"
    "fmt"
    "os"
    "path/filepath"
    "sync"
)

func main() {
    flag.Parse()
    args := flag.Args()

    if len(args) == 0 {
        fmt.Println("Usage: go run main.go <path1> <path2> ...")
        os.Exit(1)
    }

    var wg sync.WaitGroup
    walkErrors := make(chan error, len(args))

    for _, arg := range args {
        wg.Add(1)
        go func(path string) {
            defer wg.Done()
            err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
                if err != nil {
                    fmt.Println("Error accessing:", path, err)
                    return err // Stop walking if there's an error
                }
                fmt.Println("Visiting:", path)
                return nil
            })
            if err != nil {
                walkErrors <- err
            }
        }(arg)
    }

    wg.Wait()
    close(walkErrors)

    hasErrors := false
    for err := range walkErrors {
        fmt.Println("Walk error:", err)
        hasErrors = true
    }

    if hasErrors {
        os.Exit(1)
    }

    fmt.Println("All walks completed successfully.")
}