rust/tests/ui/structs-enums/nonzero-enum.rs
2024-02-16 20:02:50 +00:00

31 lines
504 B
Rust

//@ run-pass
#![allow(dead_code)]
use std::mem::size_of;
enum E {
A = 1,
B = 2,
C = 3,
}
struct S {
a: u16,
b: u8,
e: E,
}
fn main() {
assert_eq!(size_of::<E>(), 1);
assert_eq!(size_of::<Option<E>>(), 1);
assert_eq!(size_of::<Result<E, ()>>(), 1);
assert_eq!(size_of::<Option<S>>(), size_of::<S>());
let enone = None::<E>;
let esome = Some(E::A);
if let Some(..) = enone {
panic!();
}
if let None = esome {
panic!();
}
}