t.Errorf("ParseGlob: %v\nwanted error about already having Executed", err)
	}
	if _, err := c.root.AddParseTree("t1", c.root.Tree); err == nil || !strings.Contains(err.Error(), "Execute") {
		t.Errorf("AddParseTree: %v\nwanted error about already having Executed", err)
	}
}

func TestNumbers(t *testing.T) {
	c := newTestCase(t)

		rightDelim: t.rightDelim,
	}
}

// AddParseTree associates the argument parse tree with the template t, giving
// it the specified name. If the template has not been defined, this tree becomes
// its definition. If it has been defined and already has that name, the existing
// definition is replaced; otherwise a new template is created, defined, and returned.
func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) {

	}

	// Define a named template with specified contents.
	def := func(name, contents string) {
		sub := template.New(name)
		template.Must(sub.Parse(contents))
		template.Must(templates.AddParseTree(name, sub.Tree))
	}

	// Embedded files.
	def("css", loadCSS("html/common.css"))
	def("header", loadFile("html/header.html"))
	def("graph", loadFile("html/graph.html"))
	def("graph_css", loadCSS("html/graph.css"))

	if err != nil {
		t.Fatal(err)
	}
	// Add a new parse tree.
	tree, err := parse.Parse("cloneText3", cloneText3, "", "", nil, builtins())
	if err != nil {
		t.Fatal(err)
	}
	added, err := root.AddParseTree("c", tree["c"])
	if err != nil {
		t.Fatal(err)
	}
	// Execute.
	var b strings.Builder
	err = added.ExecuteTemplate(&b, "a", 0)
	if err != nil {
		t.Fatal(err)
	}
	if b.String() != "broot" {

			tmpl = t.new(name)
		}
		tmpl.text = v
		tmpl.Tree = v.Tree
	}
	return t, nil
}

// AddParseTree creates a new template with the name and parse tree
// and associates it with t.
//
// It returns an error if t or any associated template has already been executed.
func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) {
	if err := t.checkCanParse(); err != nil {
		return nil, err
	}

	tmpl := New("master")
	tree, err := parse.Parse("master", master, "", "", nil)
	if err != nil {
		t.Fatalf("unexpected parse err: %v", err)
	}
	masterTree := tree["master"]
	tmpl.AddParseTree("master", masterTree) // used to panic
}

func TestRedefinition(t *testing.T) {
	var tmpl *Template
	var err error
	if tmpl, err = New("tmpl1").Parse(`{{define "test"}}foo{{end}}`); err != nil {

	tree, err := parse.Parse("t", `{{define "b"}}<a href="{{end}}`, "", "", nil, nil)
	if err != nil {
		t.Fatal(err)
	}
	added := Must(root.AddParseTree("b", tree["b"]))
	b := new(strings.Builder)
	err = added.ExecuteTemplate(b, "a", "1>0")
	if err != nil {
		t.Fatal(err)
	}
	if got, want := b.String(), ` 1&gt;0 <a href=" 1%3e0 "></a>`; got != want {

			insertedIdents[normalizeEscFn(idNode.Ident)] = true
		}
	}
	for _, name := range s {
		if !insertedIdents[normalizeEscFn(name)] {
			// When two templates share an underlying parse tree via the use of
			// AddParseTree and one template is executed after the other, this check
			// ensures that escapers that were already inserted into the pipeline on
			// the first escaping pass do not get inserted again.

necessary to have a template addressable from multiple associations, the
template definition must be parsed multiple times to create distinct *Template
values, or must be copied with [Template.Clone] or [Template.AddParseTree].

Parse may be called multiple times to assemble the various associated templates;
see [ParseFiles], [ParseGlob], [Template.ParseFiles] and [Template.ParseGlob]
for simple ways to parse related templates stored in files.

		data     = `<baz>`
		want     = `&lt;baz&gt;`
	)
	// Templates "foo" and "bar" both alias the same underlying parse tree.
	tpl := Must(New("foo").Parse(tmplText))
	if _, err := tpl.AddParseTree("bar", tpl.Tree); err != nil {
		t.Fatalf("AddParseTree error: %v", err)
	}
	var b1, b2 strings.Builder
	if err := tpl.ExecuteTemplate(&b1, "foo", data); err != nil {
		t.Fatalf(`ExecuteTemplate failed for "foo": %v`, err)
	}