Marshal doesn't handle multiple struct tag fields properly

If you have multiple struct field tags, and the first one isn't "toml" then it's ignored and the default logic kicks in for naming the fields in the serialized output.

Example:


package main

import (
        "fmt"
        "github.com/naoina/toml"
)

type cfg struct {
        MySetting string `json:"JSONMySetting",toml:"toml_my_setting"` // Does not work
        //MySetting string `toml:"toml_my_setting",json:"JSONMySetting"` // Works
}

func main() {
        c1 := cfg{"foo"}

        data, err := toml.Marshal(&c1)
        if err != nil {
                panic(err)
        }
        fmt.Printf("Serialized: %s", string(data))

        var c2 cfg

        if err := toml.Unmarshal(data, &c2); err != nil {
                panic(err)
        }
        fmt.Printf("Unmarshaled: %#v\n", c2)
}

Expected output:

Serialized: toml_my_setting="foo"
Unmarshaled: main.cfg{MySetting:"foo"}

Actual output:

Serialized: my_setting="foo"
Unmarshaled: main.cfg{MySetting:"foo"}

naoina / toml

Marshal doesn't handle multiple struct tag fields properly #33