package main

import (
	"github.com/globalsign/mgo/bson"
	"fmt"
	"encoding/json"
)

type T1 struct {
	Foo chan string `json:"-",bson:"-"`
}

type T2 struct {
	Bar chan string `bson:"-",json:"-"`
}

type T3 struct {
	Foo chan string `bson:"-"`
}

type T4 struct {
	Bar chan string `json:"-"`
}

func main() {
	_, err := bson.Marshal(&T1{Foo: make(chan string, 0)})
	if err != nil {
		fmt.Printf("json and bson fails due to multiple ignored tags: %s\n", err)
	}
	_, err = json.Marshal(&T2{Bar: make(chan string, 0)})
	if err != nil {
		fmt.Printf("bson and json fails due to multiple ignored tags: %s\n", err)
	}
	_, err = bson.Marshal(&T3{Foo: make(chan string, 0)})
	if err == nil {
		fmt.Println("bson passes due to one ignore tag.")
	}
	_, err = json.Marshal(&T4{Bar: make(chan string, 0)})
	if err == nil {
		fmt.Println("json passes due to one ignore tag.")
	}
}