{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
    /// and returns a mutable reference to the value in the entry.
    /// Ensures a value is in the entry by inserting the result of the default function if empty,
    pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V {