syntax_data: {"ast_node_type":"variable","tokens":[{"end":27,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let flow_liveness =
context_before:     if has_rustc_mir_with(tcx, def_id, sym::rustc_peek_liveness).is_some() {
context_after:             MaybeLiveLocals.iterate_to_fixpoint(tcx, body, None).into_results_cursor(body);