gistfile1.txt

package main

import (
	"encoding/json"
	"fmt"

	yaml "gopkg.in/yaml.v2"
)

type bar struct {
	X string
}

func (bar) MarshalYAML() (interface{}, error) {
	return "MarshalYAML", nil
}

func (bar) MarshalJSON() ([]byte, error) {
	return []byte(`"MarshalJSON"`), nil
}

type Foo struct {
	bar
}

func main() {
	f := Foo{bar: bar{"x"}}
	j, e := json.Marshal(f)
	if e != nil {
		fmt.Println("json error", e)
	} else {
		fmt.Println("json", string(j))
	}
	s, e := yaml.Marshal(f)
	if e != nil {
		fmt.Println("yaml error", e)
	} else {
		fmt.Println("yaml", string(s))
	}
}