Function rustc_mir_build::thir::pattern::compare_const_vals

pub(crate) fn compare_const_vals<'tcx>(
    tcx: TyCtxt<'tcx>, 
    a: &'tcx Const<'tcx>, 
    b: &'tcx Const<'tcx>, 
    param_env: ParamEnv<'tcx>, 
    ty: Ty<'tcx>
) -> Option<Ordering>