src/test/ui/specialization/min_specialization/issue-79224.rs

   1 #![feature(min_specialization)]
   2 use std::fmt::{self, Display};
   3
   4 pub enum Cow<'a, B: ?Sized + 'a, O = <B as ToOwned>::Owned>
   5 where
   6     B: ToOwned,
   7 {
   8     Borrowed(&'a B),
   9     Owned(O),
  10 }
  11
  12 impl ToString for Cow<'_, str> {
  13     fn to_string(&self) -> String {
  14         String::new()
  15     }
  16 }
  17
  18 impl<B: ?Sized> Display for Cow<'_, B> { //~ ERROR: the trait bound `B: Clone` is not satisfied [E0277]
  19     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { //~ ERROR: the trait bound `B: Clone` is not satisfied [E0277]
  20         write!(f, "foo")
  21     }
  22 }
  23
  24 fn main() {}