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#![feature(min_specialization)]
use std::fmt::{self, Display};
pub trait ToString {
fn to_string(&self) -> String;
}
impl<T: Display + ?Sized> ToString for T {
default fn to_string(&self) -> String {
todo!()
}
}
pub enum Cow<'a, B: ?Sized + 'a, O = <B as ToOwned>::Owned>
where
B: ToOwned,
{
Borrowed(&'a B),
Owned(O),
}
impl ToString for Cow<'_, str> {
fn to_string(&self) -> String {
String::new()
}
}
impl<B: ?Sized> Display for Cow<'_, B> {
//~^ ERROR: the trait bound `B: Clone` is not satisfied [E0277]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
//~^ ERROR: the trait bound `B: Clone` is not satisfied [E0277]
//~| ERROR: the trait bound `B: Clone` is not satisfied [E0277]
//~| ERROR: the trait bound `B: Clone` is not satisfied [E0277]
write!(f, "foo")
}
}
fn main() {}
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