src/test/ui/regions/regions-close-object-into-object-4.rs

   1 // revisions: base nll
   2 // ignore-compare-mode-nll
   3 //[nll] compile-flags: -Z borrowck=mir
   4
   5 trait A<T> { }
   6
   7 struct B<'a, T:'a>(&'a (dyn A<T> + 'a));
   8
   9 trait X { }
  10 impl<'a, T> X for B<'a, T> {}
  11
  12 fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
  13     Box::new(B(&*v)) as Box<dyn X>
  14     //[base]~^ ERROR E0759
  15     //[nll]~^^ ERROR the parameter type `U` may not live long enough [E0310]
  16     //[nll]~| ERROR the parameter type `U` may not live long enough [E0310]
  17     //[nll]~| ERROR the parameter type `U` may not live long enough [E0310]
  18     //[nll]~| ERROR lifetime may not live long enough
  19     //[nll]~| ERROR cannot return value referencing local data `*v` [E0515]
  20     //[nll]~| ERROR the parameter type `U` may not live long enough [E0310]
  21
  22 }
  23
  24 fn main() {}