go - 返回返回类型匹配接口(interface)的回调时出错

Question

错误示例@ play.golang.org:http://play.golang.org/p/GRoqRHnTj6

以下代码返回“prog.go:16: cannot use NewMyGame (type func() MyGame) as type func() Playable in return argument”，即使接口(interface)完全是空的。请在下面找到附带的代码，不幸的是我完全被难住了，非常感谢任何帮助。

package main

// Define an arbitrary game type
type MyGame struct{}

// Create a constructor function for arbitrary game type
func NewMyGame() MyGame {
    return MyGame{}
}

// Define an interface defining game types
type Playable interface{}

// In my app it will return a list of constructors matching interface
func Playables() func() Playable {
    return NewMyGame
}

func main() {}

Answer 1

正如错误所说，

cannot use NewMyGame (type func() MyGame) as type func() Playable

一个简单的修复是

func Playables() func() Playable {
    return func() (Playable) {
        return NewMyGame()
    }
}