{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
    /// If one is `Case` and the other is `DigitLetter`, the result is `Both`.
    /// Combines two confusion types. If either is `Both`, the result is `Both`.
    /// Otherwise, returns the non-`None` type, or `None` if both are `None`.