{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
                    let pipe_tok = closure.param_list().and_then(|p| p.pipe_token());
                ast::ClosureExpr(closure) => {
                    closure.body().and_then(|body| hl_exit_points(sema, pipe_tok, body))