14 lines
621 B
Rust
14 lines
621 B
Rust
use std::mem;
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fn main() {
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let mut target = 42;
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// Make sure we cannot use a raw-tagged `&mut` pointing to a frozen location.
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// Even just creating it unfreezes.
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let raw = &mut target as *mut _; // let this leak to raw
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let reference = unsafe { &*raw }; // freeze
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let _ptr = reference as *const _ as *mut i32; // raw ptr, with raw tag
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let _mut_ref: &mut i32 = unsafe { mem::transmute(raw) }; // &mut, with raw tag
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// Now we retag, making our ref top-of-stack -- and, in particular, unfreezing.
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let _val = *reference; //~ ERROR: /read access .* tag does not exist in the borrow stack/
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}
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