rust/tests/compile-fail/provenance/ptr_invalid.rs

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#![feature(strict_provenance)]
// Ensure that a `ptr::invalid` ptr is truly invalid.
fn main() {
let x = 42;
let xptr = &x as *const i32;
let xptr_invalid = std::ptr::invalid::<i32>(xptr.expose_addr());
let _val = unsafe { *xptr_invalid }; //~ ERROR is not a valid pointer
}