tests/ui/associated-types/normalization-debruijn-1.rs

   1 // build-pass
   2 // edition:2018
   3
   4 // Regression test to ensure we handle debruijn indices correctly in projection
   5 // normalization under binders. Found in crater run for #85499
   6
   7 use std::future::Future;
   8 use std::pin::Pin;
   9 pub enum Outcome<S, E> {
  10     Success((S, E)),
  11 }
  12 pub struct Request<'r> {
  13     _marker: std::marker::PhantomData<&'r ()>,
  14 }
  15 pub trait FromRequest<'r>: Sized {
  16     type Error;
  17     fn from_request<'life0>(
  18         request: &'r Request<'life0>,
  19     ) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>>>>;
  20 }
  21 impl<'r, T: FromRequest<'r>> FromRequest<'r> for Option<T> {
  22     type Error = ();
  23     fn from_request<'life0>(
  24         request: &'r Request<'life0>,
  25     ) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>>>> {
  26         Box::pin(async move {
  27             let request = request;
  28             match T::from_request(request).await {
  29                 _ => todo!(),
  30             }
  31         });
  32         todo!()
  33     }
  34 }
  35
  36 fn main() {}