unsafe fn unsafe_fn() {}

union Union {
    a: u32,
    b: f32,
}

struct HasUnsafeFn;

impl HasUnsafeFn {
    unsafe fn unsafe_method(&self) {}
}

fn main() {
    let x = &5 as *const usize;
    let u = Union { b: 0 };
    unsafe {
        unsafe_fn();
        let b = u.b;
        match u {
            Union { b: 0 } => (),
            Union { a } => (),
        }
        HasUnsafeFn.unsafe_method();
        let y = *(x);
        let z = -x;
    }
}