//@compile-flags: -Zmiri-permissive-provenance #![feature(strict_provenance)] // If we have only exposed read-only pointers, doing a write through a wildcard ptr should fail. fn main() { let mut x = 0; let _fool = &mut x as *mut i32; // this would have fooled the old untagged pointer logic let addr = (&x as *const i32).expose_addr(); let ptr = std::ptr::from_exposed_addr_mut::(addr); unsafe { *ptr = 0 }; //~ ERROR: borrow stack }