Golang语法错误：写入文件时出现意外的EOF

syntax error: unexpected EOF

b, err := json.Marshal(gfjson)
    if err != nil {
        panic(err)

    filename := ".gfjson"

    f, err := os.Create(filename)
    if err != nil {
        panic(err)
    }
    // close file on exit and check for returned error
    defer func() {
        if err := f.Close(); err != nil {
            panic(err)
        }
    }()


    if _, err := f.Write(b); err != nil {
        panic(err)
    }

    fmt.Fprintf(os.Stdout, "GFJSON file successfully created.
")
}