func (p InterImpl) Foo(x int) {
}

type InterImpl2 InterImpl

func (p *InterImpl2) Foo(x int) {
	if p == nil {
		InterImpl{}.Foo(x)
	}
	InterImpl(*p).Foo(x)
}

func TestRaceInterCall(t *testing.T) {
	c := make(chan bool, 1)
	p := InterImpl{}
	var x Inter = p
	go func() {
		p2 := InterImpl{}
		x = p2
		c <- true
	}()
	x.Foo(0)
	<-c
}