src/test/ui/generic-associated-types/projection-type-lifetime-mismatch.rs

   1 #![allow(incomplete_features)]
   2 #![feature(generic_associated_types)]
   3
   4 pub trait X {
   5     type Y<'a>;
   6     fn m(&self) -> Self::Y<'_>;
   7 }
   8
   9 impl X for () {
  10     type Y<'a> = &'a ();
  11
  12     fn m(&self) -> Self::Y<'_> {
  13         self
  14     }
  15 }
  16
  17 fn f(x: &impl for<'a> X<Y<'a> = &'a ()>) -> &'static () {
  18     x.m()
  19     //~^ ERROR explicit lifetime required
  20 }
  21
  22 fn g<T: for<'a> X<Y<'a> = &'a ()>>(x: &T) -> &'static () {
  23     x.m()
  24     //~^ ERROR explicit lifetime required
  25 }
  26
  27 fn h(x: &()) -> &'static () {
  28     x.m()
  29     //~^ ERROR explicit lifetime required
  30 }
  31
  32 fn main() {
  33     f(&());
  34     g(&());
  35     h(&());
  36 }