| //@compile-flags: -Zmiri-permissive-provenance |
| |
| fn main() { |
| unsafe { |
| let root = &mut 42; |
| let addr = root as *mut i32 as usize; |
| let exposed_ptr = addr as *mut i32; |
| // From the exposed ptr, we get a new unique ptr. |
| let root2 = &mut *exposed_ptr; |
| // let _fool = root2 as *mut _; // this would fool us, since SRW(N+1) remains on the stack |
| // Stack: Unknown(<N), Unique(N) |
| // Stack if _fool existed: Unknown(<N), Unique(N), SRW(N+1) |
| // And we test that it has uniqueness by doing a conflicting read. |
| let _val = *exposed_ptr; |
| // Stack: Unknown(<N), Disabled(N) |
| // collapsed to Unknown(<N) |
| // Stack if _fool existed: Unknown(<N), Disabled(N), SRW(N+1); collapsed to Unknown(<N+2) which would not cause an ERROR |
| let _val = *root2; //~ ERROR: /read access .* tag does not exist in the borrow stack/ |
| } |
| } |
