{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":".unwrap_or((Expr::Missing,"}]}
                    .unwrap_or((Expr::Missing, HygieneId::ROOT));
                    .map(|(path, hygiene)| (Expr::Path(path), hygiene))
                let expr_id = self.alloc_expr(path, syntax_ptr);