{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
                        let closure_in_file = InFile::new(file_id, c.into());
                        let pipe_tok = c.param_list().and_then(|it| it.pipe_token())?.text_range();
                        Some(expr_to_nav(db, closure_in_file, Some(pipe_tok)))