t.Errorf("output did not contain expected string %q", want)
	}
}

func TestTracebackRuntimeFunction(t *testing.T) {
	testenv.MustHaveExec(t)
	cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=TestTracebackRuntimeFunction"))
	cmd.Env = append(cmd.Env, "GO_TEST_RUNTIME_NPE_READMEMSTATS=1")
	out, err := cmd.CombinedOutput()
	t.Logf("%s", out)
	if err == nil {