| // Issue 36278: On an unsized struct with >1 level of nontrivial |
| // nesting, ensure we are computing dynamic size of prefix correctly. |
| |
| use std::mem; |
| |
| const SZ: usize = 100; |
| struct P<T: ?Sized>(#[allow(dead_code)] [u8; SZ], T); |
| |
| type Ack<T> = P<P<T>>; |
| |
| fn main() { |
| let size_of_sized; |
| let size_of_unsized; |
| let x: Box<Ack<[u8; 0]>> = Box::new(P([0; SZ], P([0; SZ], [0; 0]))); |
| size_of_sized = mem::size_of_val::<Ack<_>>(&x); |
| let align_of_sized = mem::align_of_val::<Ack<_>>(&x); |
| let y: Box<Ack<[u8]>> = x; |
| size_of_unsized = mem::size_of_val::<Ack<_>>(&y); |
| assert_eq!(size_of_sized, size_of_unsized); |
| assert_eq!(align_of_sized, 1); |
| assert_eq!(mem::align_of_val::<Ack<_>>(&y), 1); |
| } |
