30 lines
666 B
Rust
30 lines
666 B
Rust
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// check-pass
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// Checks that we can infer a closure signature even if the `FnOnce` bound is
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// a supertrait of the obligations we have currently registered for the Ty var.
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pub trait Receive<T, E>: FnOnce(Result<T, E>) {
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fn receive(self, res: Result<T, E>);
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}
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impl<T, E, F: FnOnce(Result<T, E>)> Receive<T, E> for F {
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fn receive(self, res: Result<T, E>) {
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self(res)
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}
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}
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pub trait Async<T, E> {
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fn receive<F: Receive<T, E>>(self, f: F);
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}
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impl<T, E> Async<T, E> for Result<T, E> {
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fn receive<F: Receive<T, E>>(self, f: F) {
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f(self)
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}
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}
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pub fn main() {
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Ok::<u32, ()>(123).receive(|res| {
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res.unwrap();
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});
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}
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