toml parse error

[Liudon]

config.toml

[Shard]

  [[Shard.a]]
    Table="a"

  [[Shard.a]]
    Table="b"

code

    type Conf struct {
	    Shard map[string][]struct {
		    Table string
	    }
    }

    viper.SetConfigFile("./config.toml")
    
    // If a config file is found, read it in.
    if err := viper.ReadInConfig(); err == nil {
    fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
    }
    
    conf := &Conf{}
    err := viper.Unmarshal(conf)
    if err != nil {
    fmt.Fprintln(os.Stderr, "unable to decode into config struct", err)
    }
    
    fmt.Printf("conf: %+v \n", conf)
    fmt.Println("setting:", viper.GetViper().AllSettings())

output:

conf: &{Shard:[]} 
setting: map[[shard:map[a]:map[table:b]]]

[Liudon]

    type Conf struct {
	    Shard map[string][]struct {
		    Table string
	    }
    }

    viper.SetConfigType("toml")  // need this !!!
    viper.SetConfigFile("./config.toml")
    
    // If a config file is found, read it in.
    if err := viper.ReadInConfig(); err == nil {
    fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
    }
    
    conf := &Conf{}
    err := viper.Unmarshal(conf)
    if err != nil {
    fmt.Fprintln(os.Stderr, "unable to decode into config struct", err)
    }
    
    fmt.Printf("conf: %+v \n", conf)
    fmt.Println("setting:", viper.GetViper().AllSettings())

resolved.