{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
        let snapshot = if self.token == token::OpenParen {
    fn parse_expr_fn_call(&mut self, lo: Span, fun: P<Expr>) -> P<Expr> {
            Some((self.create_snapshot_for_diagnostic(), fun.kind.clone()))