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https://github.com/rust-lang/rust
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21 lines
650 B
Rust
21 lines
650 B
Rust
#![feature(generators, generator_trait)]
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use std::cell::RefCell;
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use std::ops::Generator;
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use std::pin::Pin;
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fn main() {
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let (mut gen, cell);
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cell = Box::new(RefCell::new(0));
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let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
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//~^ ERROR `*cell` does not live long enough [E0597]
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// the upvar is the non-dropck `&mut Option<Ref<'a, i32>>`.
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gen = || {
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// but the generator can use it to drop a `Ref<'a, i32>`.
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let _d = ref_.take(); //~ ERROR `ref_` does not live long enough
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yield;
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};
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Pin::new(&mut gen).resume(());
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// drops the RefCell and then the Ref, leading to use-after-free
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}
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