expected = []string{"abcd"}
	got = g.split(inLine + "\n")

	if !reflect.DeepEqual(got, expected) {
		t.Errorf("split(%q): got %q expected %q", inLine, got, expected)
	}

	const val = "someNewValue"
	os.Setenv("_Z", val)

	// try again with the properly-escaped variable.

	inLine = "//go:generate -command CMD2 \"ab${DOLLAR}{_Z}cd\""
	expected = []string{"-command", "CMD2", "ab${_Z}cd"}