src/test/ui/traits/issue-65673.rs

   1 #![feature(trait_alias)] // Enabled to reduce stderr output, but can be triggered even if disabled.
   2 trait Trait {}
   3 trait WithType {
   4     type Ctx;
   5 }
   6 trait Alias<T> = where T: Trait;
   7
   8 impl<T> WithType for T {
   9     type Ctx = dyn Alias<T>;
  10     //~^ ERROR at least one trait is required for an object type [E0224]
  11 }
  12 fn main() {}