unsafe rust most basic example ever

gistfile1.rs

struct Vertex {
	id: i32,
}

impl Vertex {
	fn test(&mut self, num:i32) {
		self.id = num;
	}
}

fn main() {

	let mut v = Vertex{id:1};

	unsafe {
		let v2: *mut Vertex = &mut v;
		v2.as_mut().unwrap().test(5);
	}
}