// ignore-test validation_op is disabled #![allow(unused_variables)] mod safe { // This makes a ref that was passed to us via &mut alias with things it should not alias with pub(crate) fn safe(x: &mut &u32, target: &mut u32) { unsafe { *x = &mut *(target as *mut _); } } } fn main() { let target = &mut 42; let mut target_alias = &42; // initial dummy value safe::safe(&mut target_alias, target); //~ ERROR: in conflict with lock ReadLock }