// This should fail even without validation // compile-flags: -Zmiri-disable-validation use std::ptr; use std::rc::{Rc, Weak}; /// Taken from the `Weak::as_ptr` doctest. fn main() { let strong = Rc::new(Box::new(42)); let weak = Rc::downgrade(&strong); // Both point to the same object assert!(ptr::eq(&*strong, Weak::as_ptr(&weak))); // The strong here keeps it alive, so we can still access the object. assert_eq!(42, **unsafe { &*Weak::as_ptr(&weak) }); drop(strong); // But not any more. We can do Weak::as_raw(&weak), but accessing the pointer would lead to // undefined behaviour. assert_eq!(42, **unsafe { &*Weak::as_ptr(&weak) }); //~ ERROR dereferenced after this allocation got freed }