// for embedding in a Node. Embedded in all non-trivial Nodes.
func (t NodeType) Type() NodeType {
	return t
}

const (
	NodeText       NodeType = iota // Plain text.
	NodeAction                     // A non-control action such as a field evaluation.
	NodeBool                       // A boolean constant.
	NodeChain                      // A sequence of field accesses.

		{"Mode", Type, 16},
		{"New", Func, 0},
		{"NewIdentifier", Func, 0},
		{"NilNode", Type, 1},
		{"NilNode.NodeType", Field, 4},
		{"NilNode.Pos", Field, 1},
		{"Node", Type, 0},
		{"NodeAction", Const, 0},
		{"NodeBool", Const, 0},
		{"NodeBreak", Const, 18},
		{"NodeChain", Const, 1},
		{"NodeCommand", Const, 0},
		{"NodeComment", Const, 16},
		{"NodeContinue", Const, 18},