mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
20 lines
584 B
Rust
20 lines
584 B
Rust
// run-pass
|
|
// 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;
|
|
#[allow(dead_code)]
|
|
struct P<T: ?Sized>([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 y: Box<Ack<[u8 ]>> = x;
|
|
size_of_unsized = mem::size_of_val::<Ack<_>>(&y);
|
|
assert_eq!(size_of_sized, size_of_unsized);
|
|
}
|