t.Errorf("testcase %q: Flags mismatch for %q: got %s, wanted %s",
			tc, dfn, dfp.Flags.String(), efp.Flags.String())
	}
	// Compare returns
	rgot := propBitsToString[ResultPropBits](dfp.ResultFlags)
	rwant := propBitsToString[ResultPropBits](efp.ResultFlags)
	if rgot != rwant {
		t.Errorf("testcase %q: Results mismatch for %q: got:\n%swant:\n%s",
			tc, dfn, rgot, rwant)
	}
	// Compare receiver + params.

	for _, pf := range props.ParamFlags {
		if adj, ok := paramFlagToPositiveAdj[pf]; ok {
			score, tmask = adjustScore(adj, score, tmask)
		}
	}
	for _, rf := range props.ResultFlags {
		if adj, ok := resultFlagToPositiveAdj[rf]; ok {
			score, tmask = adjustScore(adj, score, tmask)
		}
	}

	if debugTrace&debugTraceScoring != 0 {
		fmt.Fprintf(os.Stderr, "=-= largestScore(%v) is %d\n",