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use core::ptr; pub fn main() { fn nondet() -> bool { let b = Box::new(0); //ptr::from_ref(&*b).to_addr() % 3 == 0 ptr::from_ref(&*b).addr() % 3 == 0 } let a1 = 0; let a2 = 1; //let a1addr = ptr::from_ref(&a1).to_exposed_addr(); let a1addr = ptr::from_ref(&a1).expose_provenance(); //let a2addr = ptr::from_ref(&a2).to_exposed_addr(); let a2addr = ptr::from_ref(&a2).expose_provenance(); let b: bool = nondet(); // demonic non-det choice //let x = ptr::from_exposed_addr(a1addr); // picks provenance of a1 or a2 let x: *const i32 = ptr::with_exposed_provenance(a1addr); // picks provenance of a1 or a2 let y = if b { x } else { x.with_addr(a2addr) }; // Finally we need unsafe here because this, at last, is not necessarily safe to do let val = unsafe { *y }; // After all that lets see what val was (we should be able to predict) println!("{val}"); }
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