src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-elided.rs

   1 // edition:2018
   2 // build-pass (FIXME(62277): could be check-pass?
   3
   4 trait Trait<'a, 'b> {}
   5 impl<T> Trait<'_, '_> for T {}
   6
   7 // Test case where we have elision in the impl trait and we have to
   8 // pick the right region.
   9
  10 // Ultimately `Trait<'x, 'static>`.
  11 fn upper_bounds1(a: &u8) -> impl Trait<'_, 'static> {
  12     (a, a)
  13 }
  14
  15 // Ultimately `Trait<'x, 'x>`, so not really multiple bounds.
  16 fn upper_bounds2(a: &u8) -> impl Trait<'_, '_> {
  17     (a, a)
  18 }
  19
  20 // Kind of a weird annoying case.
  21 fn upper_bounds3<'b>(a: &u8) -> impl Trait<'_, 'b> {
  22     (a, a)
  23 }
  24
  25 fn main() {}