rust/src/test/ui/issues/issue-20413.rs

trait Foo {
  fn answer(self);
}

struct NoData<T>;
//~^ ERROR: parameter `T` is never used

impl<T> Foo for T where NoData<T>: Foo {
//~^ ERROR: overflow evaluating the requirement
  fn answer(self) {
  //~^ ERROR: overflow evaluating the requirement
    let val: NoData<T> = NoData;
  }
}

fn main() {}