if s != nil {
			t.Fatal("panic during callback:", s)
		}
	}()
	C.callGoFoo()
}

//export goFoo
func goFoo() {
	x := 1
	for i := 0; i < 10000; i++ {
		// variadic call mallocs + writes to
		variadic(x, x, x)
		if x != 1 {
			panic("bad x")
		}
	}
}

func variadic(x ...interface{}) {}

func testBlocking(t *testing.T) {
	c := make(chan int)
	go func() {