1 //@compile-flags: -Zmiri-permissive-provenance
6 let addr = root as *mut i32 as usize;
7 let exposed_ptr = addr as *mut i32;
8 // From the exposed ptr, we get a new unique ptr.
9 let root2 = &mut *exposed_ptr;
10 // let _fool = root2 as *mut _; // this would fool us, since SRW(N+1) remains on the stack
11 // Stack: Unknown(<N), Unique(N)
12 // Stack if _fool existed: Unknown(<N), Unique(N), SRW(N+1)
13 // And we test that it has uniqueness by doing a conflicting read.
14 let _val = *exposed_ptr;
15 // Stack: Unknown(<N), Disabled(N)
16 // collapsed to Unknown(<N)
17 // Stack if _fool existed: Unknown(<N), Disabled(N), SRW(N+1); collapsed to Unknown(<N+2) which would not cause an ERROR
18 let _val = *root2; //~ ERROR: /read access .* tag does not exist in the borrow stack/