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//@ check-pass
trait FnOnceForGenericRef<T>: FnOnce(&T) -> Self::FnOutput {
type FnOutput;
}
impl<T, R, F: FnOnce(&T) -> R> FnOnceForGenericRef<T> for F {
type FnOutput = R;
}
struct Data<T, D: FnOnceForGenericRef<T>> {
value: Option<T>,
output: Option<D::FnOutput>,
}
impl<T, D: FnOnceForGenericRef<T>> Data<T, D> {
fn new(value: T, f: D) -> Self {
let output = f(&value);
Self {
value: Some(value),
output: Some(output),
}
}
}
fn test() {
Data::new(String::new(), |_| {});
}
fn main() {}
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