45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
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use std::cell::RefCell;
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fn main() {
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aliasing_mut_and_shr();
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aliasing_frz_and_shr();
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}
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fn aliasing_mut_and_shr() {
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fn inner(rc: &RefCell<i32>, aliasing: &mut i32) {
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*aliasing += 4;
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let _escape_to_raw = rc as *const _;
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*aliasing += 4;
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let _shr = &*rc;
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*aliasing += 4;
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// also turning this into a frozen ref now must work
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let aliasing = &*aliasing;
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let _val = *aliasing;
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let _escape_to_raw = rc as *const _; // this must NOT unfreeze
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let _val = *aliasing;
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let _shr = &*rc; // this must NOT unfreeze
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let _val = *aliasing;
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}
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let rc = RefCell::new(23);
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let mut bmut = rc.borrow_mut();
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inner(&rc, &mut *bmut);
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drop(bmut);
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assert_eq!(*rc.borrow(), 23+12);
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}
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fn aliasing_frz_and_shr() {
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fn inner(rc: &RefCell<i32>, aliasing: &i32) {
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let _val = *aliasing;
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let _escape_to_raw = rc as *const _; // this must NOT unfreeze
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let _val = *aliasing;
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let _shr = &*rc; // this must NOT unfreeze
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let _val = *aliasing;
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}
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let rc = RefCell::new(23);
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let bshr = rc.borrow();
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inner(&rc, &*bshr);
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assert_eq!(*rc.borrow(), 23);
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}
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