18 lines
624 B
Rust
18 lines
624 B
Rust
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// compile-flags: -Zmiri-permissive-provenance
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fn main() {
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unsafe {
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let root = &mut 42;
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let addr = root as *mut i32 as usize;
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let exposed_ptr = addr as *mut i32;
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// From the exposed ptr, we get a new unique ptr.
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let root2 = &mut *exposed_ptr;
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let _fool = root2 as *mut _; // this would have fooled the old untagged pointer logic
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// Stack: Unknown(<N), Unique(N), SRW(N+1)
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// And we test that it has uniqueness by doing a conflicting write.
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*exposed_ptr = 0;
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// Stack: Unknown(<N)
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let _val = *root2; //~ ERROR: borrow stack
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}
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}
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