src/test/ui/generic-associated-types/generic-associated-type-bounds.rs

   1 // run-pass
   2
   3 #![feature(generic_associated_types)]
   4
   5 pub trait X {
   6     type Y<'a> where Self: 'a;
   7     fn m(&self) -> Self::Y<'_>;
   8 }
   9
  10 impl X for () {
  11     type Y<'a> = &'a ();
  12
  13     fn m(&self) -> Self::Y<'_> {
  14         self
  15     }
  16 }
  17
  18 fn f(x: &impl for<'a> X<Y<'a> = &'a ()>) -> &() {
  19     x.m()
  20 }
  21
  22 fn g<T: for<'a> X<Y<'a> = &'a ()>>(x: &T) -> &() {
  23     x.m()
  24 }
  25
  26 fn h(x: &()) -> &() {
  27     x.m()
  28 }
  29
  30 fn main() {
  31     f(&());
  32     g(&());
  33     h(&());
  34 }