tests/ui/typeck/issue-100246.rs

   1 #![recursion_limit = "5"] // To reduce noise
   2
   3 //expect incompatible type error when ambiguous traits are in scope
   4 //and not an overflow error on the span in the main function.
   5
   6 struct Ratio<T>(T);
   7
   8 pub trait Pow {
   9     fn pow(self) -> Self;
  10 }
  11
  12 impl<'a, T> Pow for &'a Ratio<T>
  13 where
  14     &'a T: Pow,
  15 {
  16     fn pow(self) -> Self {
  17         self
  18     }
  19 }
  20
  21 fn downcast<'a, W: ?Sized>() -> std::io::Result<&'a W> {
  22     todo!()
  23 }
  24
  25 struct Other;
  26
  27 fn main() -> std::io::Result<()> {
  28     let other: Other = downcast()?;//~ERROR 28:24: 28:35: `?` operator has incompatible types
  29     Ok(())
  30 }