t.Fatalf("expected error %q, got nil", test.result)
			}
			if !strings.Contains(err.Error(), test.result) {
				t.Fatalf("error %q does not contain %q", err, test.result)
			}
		})
	}
}

func TestBlock(t *testing.T) {
	const (
		input = `a{{block "inner" .}}bar{{.}}baz{{end}}b`
		outer = `a{{template "inner" .}}b`
		inner = `bar{{.}}baz`
	)
	treeSet := make(map[string]*Tree)

		t.Errorf("DeleteFunc: want nil discarded elements, got %v, %v", mem[3], mem[4])
	}
	if mem[5] == nil {
		t.Errorf("DeleteFunc: want unchanged elements beyond original len, got nil")
	}
}

func TestClone(t *testing.T) {
	s1 := []int{1, 2, 3}
	s2 := Clone(s1)
	if !Equal(s1, s2) {
		t.Errorf("Clone(%v) = %v, want %v", s1, s2, s1)
	}
	s1[0] = 4
	want := []int{1, 2, 3}
	if !Equal(s2, want) {