mirror of https://github.com/rust-lang/rust
47 lines
854 B
Rust
47 lines
854 B
Rust
//@ run-pass
|
|
//@ compile-flags: -O
|
|
|
|
#![allow(dead_code)]
|
|
|
|
#[repr(C, u8)]
|
|
enum ReprCu8 {
|
|
A(u16),
|
|
B,
|
|
}
|
|
|
|
#[repr(u8)]
|
|
enum Repru8 {
|
|
A(u16),
|
|
B,
|
|
}
|
|
|
|
#[repr(C)]
|
|
struct ReprC {
|
|
tag: u8,
|
|
padding: u8,
|
|
payload: u16,
|
|
}
|
|
|
|
fn main() {
|
|
// Test `repr(C, u8)`.
|
|
let r1 = ReprC { tag: 0, padding: 0, payload: 0 };
|
|
let r2 = ReprC { tag: 0, padding: 1, payload: 1 };
|
|
|
|
let t1: &ReprCu8 = unsafe { std::mem::transmute(&r1) };
|
|
let t2: &ReprCu8 = unsafe { std::mem::transmute(&r2) };
|
|
|
|
match (t1, t2) {
|
|
(ReprCu8::A(_), ReprCu8::A(_)) => (),
|
|
_ => assert!(false)
|
|
};
|
|
|
|
// Test `repr(u8)`.
|
|
let t1: &Repru8 = unsafe { std::mem::transmute(&r1) };
|
|
let t2: &Repru8 = unsafe { std::mem::transmute(&r2) };
|
|
|
|
match (t1, t2) {
|
|
(Repru8::A(_), Repru8::A(_)) => (),
|
|
_ => assert!(false)
|
|
};
|
|
}
|