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