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// check-pass struct AtomicRefMut<'a> { value: &'a mut i32, borrow: AtomicBorrowRefMut, } struct AtomicBorrowRefMut { } impl Drop for AtomicBorrowRefMut { fn drop(&mut self) { } } fn map(orig: AtomicRefMut) -> AtomicRefMut { AtomicRefMut { value: orig.value, borrow: orig.borrow, } } fn main() {}