src/test/ui/associated-types/normalization-generality-2.rs

   1 // build-pass
   2
   3 // Ensures that we don't regress on "implementation is not general enough" when
   4 // normalizating under binders. Unlike `normalization-generality.rs`, this also produces
   5 // type outlives predicates that we must ignore.
   6
   7 pub unsafe trait Yokeable<'a> {
   8     type Output: 'a;
   9 }
  10 pub struct Yoke<Y: for<'a> Yokeable<'a>> {
  11     _marker: std::marker::PhantomData<Y>,
  12 }
  13 impl<Y: for<'a> Yokeable<'a>> Yoke<Y> {
  14     pub fn project<P>(
  15         &self,
  16         _f: for<'a> fn(&<Y as Yokeable<'a>>::Output, &'a ()) -> <P as Yokeable<'a>>::Output,
  17     ) -> Yoke<P>
  18     where
  19         P: for<'a> Yokeable<'a>,
  20     {
  21         unimplemented!()
  22     }
  23 }
  24 pub fn slice(y: Yoke<&'static str>) -> Yoke<&'static [u8]> {
  25     y.project(move |yk, _| yk.as_bytes())
  26 }
  27 unsafe impl<'a, T: 'static + ?Sized> Yokeable<'a> for &'static T {
  28     type Output = &'a T;
  29 }
  30 fn main() {}