17 lines
418 B
Rust
17 lines
418 B
Rust
#![feature(core_intrinsics)]
|
|
|
|
extern crate core;
|
|
use core::intrinsics::discriminant_value;
|
|
|
|
#[repr(usize)]
|
|
enum MyWeirdOption<T> {
|
|
None = 0,
|
|
Some(T) = core::mem::size_of::<*mut T>(),
|
|
//~^ ERROR generic parameters may not be used
|
|
}
|
|
|
|
fn main() {
|
|
assert_eq!(discriminant_value(&MyWeirdOption::<()>::None), 0);
|
|
assert_eq!(discriminant_value(&MyWeirdOption::Some(())), core::mem::size_of::<usize>());
|
|
}
|