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//@ build-pass
//@ edition:2018
// Regression test to ensure we handle debruijn indices correctly in projection
// normalization under binders. Found in crater run for #85499
use std::future::Future;
use std::pin::Pin;
pub enum Outcome<S, E> {
Success((S, E)),
}
pub struct Request<'r> {
_marker: std::marker::PhantomData<&'r ()>,
}
pub trait FromRequest<'r>: Sized {
type Error;
fn from_request<'life0>(
request: &'r Request<'life0>,
) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>>>>;
}
impl<'r, T: FromRequest<'r>> FromRequest<'r> for Option<T> {
type Error = ();
fn from_request<'life0>(
request: &'r Request<'life0>,
) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>>>> {
Box::pin(async move {
let request = request;
match T::from_request(request).await {
_ => todo!(),
}
});
todo!()
}
}
fn main() {}
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