Target object of method is not null checked

[Caleb-o]

Currently this works, but it should have some runtime check to see if the target is null.

struct MyStructThing {
	int a;
}

fn void MyStructThing.hello(&self) {
	io::printn("Hello");
}

fn void main()
{
    MyStructThing *mst = null;
    mst.hello(); // Hello
}

[lerno]

This should now work properly.