{"ast_node_type":"function","tokens":[{"end":66,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn and_modify<F: FnOnce(&mut V)>(mut self, f: F) -> Self {
    /// Provides in-place mutable access to an occupied entry before any potential inserts into the map.
        if let Self::Occupied(ent) = &mut self {