src := filepath.Join("testdata", "mergelocals", "integration.go")
	obj := filepath.Join(tmpdir, "p.a")
	out, err := testenv.Command(t, testenv.GoToolPath(t), "tool", "compile",
		"-p=p", "-c", "1", "-o", obj, "-d=mergelocalstrace=2,mergelocals=1",
		src).CombinedOutput()
	if err != nil {
		t.Fatalf("failed to compile: %v\n%s", err, out)
	}
	vars := make(map[string]string)
	lines := strings.Split(string(out), "\n")
	prolog := true