private final Field nodeField;
    private final List children;

    public BasicAntBuilder() {
        // These are used to discard references to tasks so they can be garbage collected
        Field collectorField;
        try {
            nodeField = groovy.ant.AntBuilder.class.getDeclaredField("lastCompletedNode");
            nodeField.setAccessible(true);

		if !params.Contains(needed) {
			out.Insert(needed)
		}
	}
	return out
}

func getParams(n parse.Node) sets.String {
	out := sets.New[string]()
	switch n.Type() {
	case parse.NodeField:
		// Only look at the first identifier. For example, if the action
		// is {{.To.Config.Service}}, this will return "To" as the parameter.
		// That's all we need when looking for well-known params.

	NodeDot                        // The cursor, dot.
	nodeElse                       // An else action. Not added to tree.
	nodeEnd                        // An end action. Not added to tree.
	NodeField                      // A field or method name.
	NodeIdentifier                 // An identifier; always a function name.
	NodeIf                         // An if action.
	NodeList                       // A list of Nodes.

		}
		// Compatibility with original API: If the term is of type NodeField
		// or NodeVariable, just put more fields on the original.
		// Otherwise, keep the Chain node.
		// Obvious parsing errors involving literal values are detected here.
		// More complex error cases will have to be handled at execution time.
		switch node.Type() {
		case NodeField:
			node = t.newField(chain.Position(), chain.String())
		case NodeVariable:

		{"NodeBreak", Const, 18},
		{"NodeChain", Const, 1},
		{"NodeCommand", Const, 0},
		{"NodeComment", Const, 16},
		{"NodeContinue", Const, 18},
		{"NodeDot", Const, 0},
		{"NodeField", Const, 0},
		{"NodeIdentifier", Const, 0},
		{"NodeIf", Const, 0},
		{"NodeList", Const, 0},
		{"NodeNil", Const, 1},
		{"NodeNumber", Const, 0},
		{"NodePipe", Const, 0},

pkg text/template/parse, const NodeBool NodeType
pkg text/template/parse, const NodeCommand NodeType
pkg text/template/parse, const NodeDot NodeType
pkg text/template/parse, const NodeField NodeType
pkg text/template/parse, const NodeIdentifier NodeType
pkg text/template/parse, const NodeIf NodeType
pkg text/template/parse, const NodeList NodeType
pkg text/template/parse, const NodeNumber NodeType

pkg text/template/parse, const NodeChain = 3
pkg text/template/parse, const NodeChain NodeType
pkg text/template/parse, const NodeCommand = 4
pkg text/template/parse, const NodeDot = 5
pkg text/template/parse, const NodeField = 8
pkg text/template/parse, const NodeIdentifier = 9
pkg text/template/parse, const NodeIf = 10
pkg text/template/parse, const NodeList = 11
pkg text/template/parse, const NodeNil = 12