mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 15:23:46 +00:00
20 lines
449 B
Rust
20 lines
449 B
Rust
//@ run-pass
|
|
|
|
use std::cell::Cell;
|
|
|
|
const NONE_CELL_STRING: Option<Cell<String>> = None;
|
|
|
|
struct Foo<T>(#[allow(dead_code)] T);
|
|
impl<T> Foo<T> {
|
|
const FOO: Option<Box<T>> = None;
|
|
}
|
|
|
|
fn main() {
|
|
let _: &'static u32 = &42;
|
|
let _: &'static Option<u32> = &None;
|
|
|
|
// We should be able to peek at consts and see they're None.
|
|
let _: &'static Option<Cell<String>> = &NONE_CELL_STRING;
|
|
let _: &'static Option<Box<()>> = &Foo::FOO;
|
|
}
|