t.Errorf("testcase %q: Results mismatch for %q: got:\n%swant:\n%s",
			tc, dfn, rgot, rwant)
	}
	// Compare receiver + params.
	pgot := propBitsToString[ParamPropBits](dfp.ParamFlags)
	pwant := propBitsToString[ParamPropBits](efp.ParamFlags)
	if pgot != pwant {
		t.Errorf("testcase %q: Params mismatch for %q: got:\n%swant:\n%s",
			tc, dfn, pgot, pwant)
	}
	// Compare call sites.
	for k, ve := range ecsites {

	for idx := range call.Args {
		// ignore blanks
		if calleeRecvrParms[idx].Sym == nil ||
			calleeRecvrParms[idx].Sym.IsBlank() {
			continue
		}
		arg := call.Args[idx]
		pflag := calleeProps.ParamFlags[idx]
		if debugTrace&debugTraceScoring != 0 {
			fmt.Fprintf(os.Stderr, "=-= arg %d of %d: val %v flags=%s\n",
				idx, len(call.Args), arg, pflag.String())
		}

		if len(cs.ArgProps) == 0 {
			continue