25 lines
898 B
Rust
25 lines
898 B
Rust
// Make sure validation can handle many overlapping shared borrows for different parts of a data structure
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#![allow(unused_variables)]
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use std::cell::RefCell;
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fn evil(x: *mut i32) {
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unsafe { *x = 0; } //~ ERROR: in conflict with lock WriteLock
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}
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fn test(r: &mut RefCell<i32>) {
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let x = &*r; // releasing write lock, first suspension recorded
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let mut x_ref = x.borrow_mut();
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let x_inner : &mut i32 = &mut *x_ref; // new inner write lock, with same lifetime as outer lock
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{
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let x_inner_shr = &*x_inner; // releasing inner write lock, recording suspension
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let y = &*r; // second suspension for the outer write lock
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let x_inner_shr2 = &*x_inner; // 2nd suspension for inner write lock
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}
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// If the two locks are mixed up, here we should have a write lock, but we do not.
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evil(x_inner as *mut _);
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}
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fn main() {
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test(&mut RefCell::new(0));
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}
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