src/test/ui/hrtb/issue-95034.rs

   1 // known-bug
   2 // failure-status: 101
   3 // compile-flags: --edition=2021 --crate-type=lib
   4 // rustc-env:RUST_BACKTRACE=0
   5
   6 // normalize-stderr-test "thread 'rustc' panicked.*" -> "thread 'rustc' panicked"
   7 // normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
   8 // normalize-stderr-test "\nerror: internal compiler error.*\n\n" -> ""
   9 // normalize-stderr-test "note:.*unexpectedly panicked.*\n\n" -> ""
  10 // normalize-stderr-test "note: we would appreciate a bug report.*\n\n" -> ""
  11 // normalize-stderr-test "note: compiler flags.*\n\n" -> ""
  12 // normalize-stderr-test "note: rustc.*running on.*\n\n" -> ""
  13 // normalize-stderr-test "query stack during panic:\n" -> ""
  14 // normalize-stderr-test "we're just showing a limited slice of the query stack\n" -> ""
  15 // normalize-stderr-test "end of query stack\n" -> ""
  16 // normalize-stderr-test "#.*\n" -> ""
  17
  18 // This should not ICE.
  19
  20 // Refer to the issue for more minimized versions.
  21
  22 use std::{
  23     future::Future,
  24     marker::PhantomData,
  25     pin::Pin,
  26     task::{Context, Poll},
  27 };
  28
  29 mod object {
  30     use super::*;
  31
  32     pub trait Object<'a> {
  33         type Error;
  34         type Future: Future<Output = Self>;
  35         fn create() -> Self::Future;
  36     }
  37
  38     impl<'a> Object<'a> for u8 {
  39         type Error = ();
  40         type Future = Pin<Box<dyn Future<Output = Self>>>;
  41         fn create() -> Self::Future {
  42             unimplemented!()
  43         }
  44     }
  45
  46     impl<'a, E, A: Object<'a, Error = E>> Object<'a> for (A,) {
  47         type Error = ();
  48         type Future = CustomFut<'a, E, A>;
  49         fn create() -> Self::Future {
  50             unimplemented!()
  51         }
  52     }
  53
  54     pub struct CustomFut<'f, E, A: Object<'f, Error = E>> {
  55         ph: PhantomData<(A::Future,)>,
  56     }
  57
  58     impl<'f, E, A: Object<'f, Error = E>> Future for CustomFut<'f, E, A> {
  59         type Output = (A,);
  60         fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
  61             unimplemented!()
  62         }
  63     }
  64 }
  65
  66 mod async_fn {
  67     use super::*;
  68
  69     pub trait AsyncFn {
  70         type Future: Future<Output = ()>;
  71         fn call(&self) -> Self::Future;
  72     }
  73
  74     impl<F, Fut> AsyncFn for F
  75     where
  76         F: Fn() -> Fut,
  77         Fut: Future<Output = ()>,
  78     {
  79         type Future = Fut;
  80         fn call(&self) -> Self::Future {
  81             (self)()
  82         }
  83     }
  84 }
  85
  86 pub async fn test() {
  87     use self::{async_fn::AsyncFn, object::Object};
  88
  89     async fn create<T: Object<'static>>() {
  90         T::create().await;
  91     }
  92
  93     async fn call_async_fn(inner: impl AsyncFn) {
  94         inner.call().await;
  95     }
  96
  97     call_async_fn(create::<(u8,)>).await;
  98 }