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

   1 trait Foo {
   2   fn answer(self);
   3 }
   4
   5 struct NoData<T>;
   6 //~^ ERROR: parameter `T` is never used
   7
   8 impl<T> Foo for T where NoData<T>: Foo {
   9   //~^ ERROR: overflow evaluating the requirement
  10   //~| ERROR: overflow evaluating the requirement
  11   fn answer(self) {
  12     let val: NoData<T> = NoData;
  13   }
  14 }
  15
  16 trait Bar {
  17   fn answer(self);
  18 }
  19
  20 trait Baz {
  21   fn answer(self);
  22 }
  23
  24 struct AlmostNoData<T>(Option<T>);
  25
  26 struct EvenLessData<T>(Option<T>);
  27
  28 impl<T> Bar for T where EvenLessData<T>: Baz {
  29 //~^ ERROR: overflow evaluating the requirement
  30 //~| ERROR: overflow evaluating the requirement
  31   fn answer(self) {
  32     let val: EvenLessData<T> = EvenLessData(None);
  33   }
  34 }
  35
  36 impl<T> Baz for T where AlmostNoData<T>: Bar {
  37 //~^ ERROR: overflow evaluating the requirement
  38 //~| ERROR: overflow evaluating the requirement
  39   fn answer(self) {
  40     let val: NoData<T> = AlmostNoData(None);
  41   }
  42 }
  43
  44 fn main() {}