{"ast_node_type":"function","tokens":[{"end":100,"kind":"keyword","start":0,"text":"pub(crate)"}]}
    pub(crate) fn maybe_err_dotdotlt_syntax(&self, maybe_lt: Token, mut err: Diag<'a>) -> Diag<'a> {
    /// Check for exclusive ranges written as `..<`
        if maybe_lt == token::Lt