| // Some optimizations remove ZST accesses, thus masking this UB. |
| // compile-flags: -Zmir-opt-level=0 |
| |
| fn main() { |
| // Not using the () type here, as writes of that type do not even have MIR generated. |
| // Also not assigning directly as that's array initialization, not assignment. |
| let zst_val = [1u8; 0]; |
| |
| // make sure ZST accesses are checked against being "truly" dangling pointers |
| // (that are out-of-bounds). |
| let mut x_box = Box::new(1u8); |
| let x = (&mut *x_box as *mut u8).wrapping_offset(1); |
| // This one is just "at the edge", but still okay |
| unsafe { *(x as *mut [u8; 0]) = zst_val; } |
| // One byte further is OOB. |
| let x = x.wrapping_offset(1); |
| unsafe { *(x as *mut [u8; 0]) = zst_val; } //~ ERROR pointer must be in-bounds |
| } |
