Function longest_consecutive_prefix

pub fn longest_consecutive_prefix<T: Borrow<usize>>(
    sequence: impl IntoIterator<Item = T>,
) -> usize

This function finds the longest prefix of the form 0, 1, 2, … within the collection sequence. Examples:

• For 0, 1, 2, 4, 5; we would produce 3, meaning 0, 1, 2 is the longest satisfying prefix.
• For 1, 2, 3, 4; we would produce 0, meaning there is no such prefix.