mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-16 02:24:35 +00:00
23 lines
594 B
Rust
23 lines
594 B
Rust
// check-pass
|
|
// pretty-expanded FIXME #23616
|
|
|
|
pub trait Promisable: Send + Sync {}
|
|
impl<T: Send + Sync> Promisable for T {}
|
|
|
|
pub fn propagate<'a, T, E, F, G>(mut action: F)
|
|
-> Box<dyn FnMut(Result<T, E>) -> Result<T, E> + 'a>
|
|
where
|
|
T: Promisable + Clone + 'a,
|
|
E: Promisable + Clone + 'a,
|
|
F: FnMut(&T) -> Result<T, E> + Send + 'a,
|
|
G: FnMut(Result<T, E>) -> Result<T, E> + 'a {
|
|
Box::new(move |result: Result<T, E>| {
|
|
match result {
|
|
Ok(ref t) => action(t),
|
|
Err(ref e) => Err(e.clone()),
|
|
}
|
|
})
|
|
}
|
|
|
|
fn main() {}
|