t.Errorf("got %s (%#[1]v), want %s (%#[2]v)", got, tm)
		}
		if g, w := got.Location(), tm.Location(); g != w {
			t.Errorf("%s: location: got %v, want %v", tm, g, w)
		}
	}
}

func TestEmptyGroup(t *testing.T) {
	g := GroupValue(
		Int("a", 1),
		Group("g1", Group("g2")),
		Group("g3", Group("g4", Int("b", 2))))
	got := g.Group()
	want := []Attr{Int("a", 1), Group("g3", Group("g4", Int("b", 2)))}