{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ty_is_known_nonnull(tcx,"}]}
            ty_is_known_nonnull(tcx, typing_env, *base, mode)
        ty::Pat(base, pat) => {
                || pat_ty_is_known_nonnull(tcx, typing_env, *pat)