rust/tests/ui/coroutine/check-resume-ty-lifetimes-2.rs
2024-01-04 01:47:56 +00:00

36 lines
916 B
Rust

#![feature(coroutine_trait)]
#![feature(coroutines)]
use std::ops::Coroutine;
struct Contravariant<'a>(fn(&'a ()));
struct Covariant<'a>(fn() -> &'a ());
fn bad1<'short, 'long: 'short>() -> impl Coroutine<Covariant<'short>> {
|_: Covariant<'short>| {
let a: Covariant<'long> = yield ();
//~^ ERROR lifetime may not live long enough
}
}
fn bad2<'short, 'long: 'short>() -> impl Coroutine<Contravariant<'long>> {
|_: Contravariant<'long>| {
let a: Contravariant<'short> = yield ();
//~^ ERROR lifetime may not live long enough
}
}
fn good1<'short, 'long: 'short>() -> impl Coroutine<Covariant<'long>> {
|_: Covariant<'long>| {
let a: Covariant<'short> = yield ();
}
}
fn good2<'short, 'long: 'short>() -> impl Coroutine<Contravariant<'short>> {
|_: Contravariant<'short>| {
let a: Contravariant<'long> = yield ();
}
}
fn main() {}