| #![feature(const_transmute)] |
| #![allow(const_err)] // make sure we cannot allow away the errors tested here |
| |
| use std::mem; |
| |
| #[derive(Copy, Clone)] |
| enum Bar {} |
| |
| #[repr(C)] |
| union MaybeUninit<T: Copy> { |
| uninit: (), |
| init: T, |
| } |
| |
| const BAD_BAD_BAD: Bar = unsafe { MaybeUninit { uninit: () }.init }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| const BAD_BAD_REF: &Bar = unsafe { mem::transmute(1usize) }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| const BAD_BAD_ARRAY: [Bar; 1] = unsafe { MaybeUninit { uninit: () }.init }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| fn main() {} |
