src/test/ui/object-safety/object-safety-generics.rs

   1 // Check that we correctly prevent users from making trait objects
   2 // from traits with generic methods, unless `where Self : Sized` is
   3 // present.
   4 // revisions: curr object_safe_for_dispatch
   5
   6 #![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
   7
   8
   9 trait Bar {
  10     fn bar<T>(&self, t: T);
  11 }
  12
  13 trait Quux {
  14     fn bar<T>(&self, t: T)
  15         where Self : Sized;
  16 }
  17
  18 fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
  19     //[curr]~^ ERROR E0038
  20     t
  21     //[object_safe_for_dispatch]~^ ERROR E0038
  22 }
  23
  24 fn make_bar_explicit<T:Bar>(t: &T) -> &dyn Bar {
  25     //[curr]~^ ERROR E0038
  26     t as &dyn Bar
  27     //[object_safe_for_dispatch]~^ ERROR E0038
  28 }
  29
  30 fn make_quux<T:Quux>(t: &T) -> &dyn Quux {
  31     t
  32 }
  33
  34 fn make_quux_explicit<T:Quux>(t: &T) -> &dyn Quux {
  35     t as &dyn Quux
  36 }
  37
  38 fn main() {
  39 }