Function rustc_typeck::check::wfcheck::region_known_to_outlive

fn region_known_to_outlive<'tcx>(
    tcx: TyCtxt<'tcx>, 
    id: HirId, 
    param_env: ParamEnv<'tcx>, 
    wf_tys: &FxHashSet<Ty<'tcx>>, 
    region_a: Region<'tcx>, 
    region_b: Region<'tcx>
) -> bool