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