mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-31 06:22:00 +00:00
36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
// run-pass
|
|
|
|
#![allow(non_upper_case_globals)]
|
|
#![allow(dead_code)]
|
|
/*!
|
|
* On x86_64-linux-gnu and possibly other platforms, structs get 8-byte "preferred" alignment,
|
|
* but their "ABI" alignment (i.e., what actually matters for data layout) is the largest alignment
|
|
* of any field. (Also, `u64` has 8-byte ABI alignment; this is not always true).
|
|
*
|
|
* On such platforms, if monomorphize uses the "preferred" alignment, then it will unify
|
|
* `A` and `B`, even though `S<A>` and `S<B>` have the field `t` at different offsets,
|
|
* and apply the wrong instance of the method `unwrap`.
|
|
*/
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct S<T> { i:u8, t:T }
|
|
|
|
impl<T> S<T> {
|
|
fn unwrap(self) -> T {
|
|
self.t
|
|
}
|
|
}
|
|
|
|
#[derive(Copy, Clone, PartialEq, Debug)]
|
|
struct A((u32, u32));
|
|
|
|
#[derive(Copy, Clone, PartialEq, Debug)]
|
|
struct B(u64);
|
|
|
|
pub fn main() {
|
|
static Ca: S<A> = S { i: 0, t: A((13, 104)) };
|
|
static Cb: S<B> = S { i: 0, t: B(31337) };
|
|
assert_eq!(Ca.unwrap(), A((13, 104)));
|
|
assert_eq!(Cb.unwrap(), B(31337));
|
|
}
|