3 trait FnOnceForGenericRef<T>: FnOnce(&T) -> Self::FnOutput {
7 impl<T, R, F: FnOnce(&T) -> R> FnOnceForGenericRef<T> for F {
11 struct Data<T, D: FnOnceForGenericRef<T>> {
13 output: Option<D::FnOutput>,
16 impl<T, D: FnOnceForGenericRef<T>> Data<T, D> {
17 fn new(value: T, f: D) -> Self {
18 let output = f(&value);
27 Data::new(String::new(), |_| {});