NodeVariable                   // A $ variable.
	NodeWith                       // A with action.
	NodeComment                    // A comment.
	NodeBreak                      // A break action.
	NodeContinue                   // A continue action.
)

// Nodes.

// ListNode holds a sequence of nodes.
type ListNode struct {
	NodeType
	Pos
	tr    *Tree
	Nodes []Node // The element nodes in lexical order.
}

		{"Node", Type, 0},
		{"NodeAction", Const, 0},
		{"NodeBool", Const, 0},
		{"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},