Golang struct can satisfy three interfaces

README.md

Output is:

Yellow is RED and GREEN
Cyan is BLUE and GREEN
Purple is RED and BLUE

https://play.golang.org/p/84wm-XGtsO

main.go

package main

import (
	"fmt"
)

type Yellow interface {
	Red() string
	Green() string
}

type Cyan interface {
	Green() string
	Blue() string
}

type Purple interface {
	Red() string
	Blue() string
}

type RGB struct {}

func (rgb *RGB) Red() string {
	return "RED"
}

func (rgb *RGB) Green() string {
	return "GREEN"
}

func (rgb *RGB) Blue() string {
	return "BLUE"
}

func Demo(yellow Yellow, cyan Cyan, purple Purple) {
	fmt.Println("Yellow is "+yellow.Red()+" and "+yellow.Green())
	fmt.Println("Cyan is "+cyan.Blue()+" and "+cyan.Green())
	fmt.Println("Purple is "+purple.Red()+" and "+purple.Blue())
}

func main() {
	c := &RGB{}
	Demo(c, c, c)
}