src/test/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs

   1 // revisions: rust2015 rust2018
   2 //[rust2018] edition:2018
   3
   4 trait WithType<T> {}
   5 trait WithRegion<'a> { }
   6
   7 trait Foo { }
   8
   9 impl<T> Foo for Vec<T>
  10 where
  11     T: WithRegion<'_>
  12 //[rust2015,rust2018]~^ ERROR `'_` cannot be used here
  13 { }
  14
  15 fn main() {}