{"ast_node_type":"function","tokens":[{"end":88,"kind":"keyword","start":0,"text":"fn"}]}
    fn parse_initializer(&mut self, eq_optional: bool) -> PResult<'a, Option<P<Expr>>> {
    /// Parses the RHS of a local variable declaration (e.g., `= 14;`).
        let eq_consumed = match self.token.kind {