| #[derive(PartialEq, Debug)] | |
| struct A; | |
| fn zst_ret() -> A { | |
| A | |
| } | |
| fn use_zst() -> A { | |
| let a = A; | |
| a | |
| } | |
| 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]; | |
| assert_eq!(zst_ret(), A); | |
| assert_eq!(use_zst(), A); | |
| let x = 42 as *mut [u8; 0]; | |
| // Reading and writing is ok. | |
| unsafe { *x = zst_val; } | |
| unsafe { let _y = *x; } | |
| } |