rust/tests/compile-fail/validation_recover2.rs

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#![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
}