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use std::borrow::Cow;

trait CustomInto<T> {
    fn custom_into(self) -> T;
}

impl<'a> CustomInto<Cow<'a, str>> for &'a str {
    fn custom_into(self) -> Cow<'a, str> {
        Cow::Borrowed(self)
    }
}

fn main(){
    let _cow = "hello there".custom_into();    
}