Method add_item

regex/regex-syntax/src/ast/mod.rs:1283–1291

Add the given item to this sequence of flags. If the item was added successfully, then `None` is returned. If the given item is a duplicate, then `Some(i)` is returned, where `items[i].kind == item.kind`.

(&mut self, item: FlagsItem)

    /// given item is a duplicate, then `Some(i)` is returned, where
    /// `items[i].kind == item.kind`.
    pub fn add_item(&mut self, item: FlagsItem) -> Option<usize> {
        for (i, x) in self.items.iter().enumerate() {
            if x.kind == item.kind {
                return Some(i);
            }
        }
        self.items.push(item);
        None
    }

    /// Returns the state of the given flag in this set.
    ///