mirror of https://github.com/rust-lang/rust
42 lines
833 B
Rust
42 lines
833 B
Rust
//@ run-pass
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use std::cell::RefCell;
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struct S<'a>(i32, &'a RefCell<Vec<i32>>);
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impl<'a> Drop for S<'a> {
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fn drop(&mut self) {
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self.1.borrow_mut().push(self.0);
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}
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}
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fn test(drops: &RefCell<Vec<i32>>) {
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let mut foo = None;
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let pfoo: *mut _ = &mut foo;
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match foo {
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None => (),
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_ => return,
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}
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// Both S(0) and S(1) should be dropped, but aren't.
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unsafe { *pfoo = Some((S(0, drops), S(1, drops))); }
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match foo {
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Some((_x, _)) => {}
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_ => {}
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}
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}
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fn main() {
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let drops = RefCell::new(Vec::new());
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test(&drops);
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// Ideally, we want this...
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//assert_eq!(*drops.borrow(), &[0, 1]);
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// But the delayed access through the raw pointer confuses drop elaboration,
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// causing S(1) to be leaked.
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assert_eq!(*drops.borrow(), &[0]);
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}
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