Trash code

trash.rs

fn parse_crate<'a, I>(chs: &'a mut I) -> Option<char>
where
    I: Iterator<Item = char>,
{
    fn is_for_crate<'a, I>(c: char, chs: &'a mut I) -> bool
    where
        I: Iterator<Item = char>,
    {
        if c == '[' || c == ']' {
            true
        } else {
            // we want to consume until the next BEFORE the next
            // basically eating the whitespace
            while let Some(' ') = chs.peekable().peek() {
                chs.next();
            }
            false
        }
    }
    let c = chs.next()?;
    is_for_crate(c, chs).then_some(())?; // Eat the first [
    let ch = chs.next()?;
    let c = chs.next()?;
    is_for_crate(c, chs).then_some(())?; // Eat the last ]
    chs.next(); // Eat the last space (if any)
    Some(ch)
}