with: Working with Closures

with as in “do X, but with this specific way of computing things.”

#![allow(unused)]
fn main() {
impl<T> Vec<T> {
    // Simplified. If the resize is larger than the current vec size, use the
    // closure to populate elements.
    pub fn resize_with(&mut self, new_len: usize, f: impl FnMut() -> T);
}

mod iter {
    // Create an infinite, lazy iterator using a closure.
    pub fn repeat_with<A, F: FnMut() -> A>(repeater: F) -> RepeatWith<F>;
}
}