tr *Tree
}

func (t *Tree) newDot(pos Pos) *DotNode {
	return &DotNode{tr: t, NodeType: NodeDot, Pos: pos}
}

func (d *DotNode) Type() NodeType {
	// Override method on embedded NodeType for API compatibility.
	// TODO: Not really a problem; could change API without effect but
	// api tool complains.
	return NodeDot
}

func (d *DotNode) String() string {
	return "."
}

		t.errorf("missing value for %s", context)
	}
	// Only the first command of a pipeline can start with a non executable operand
	for i, c := range pipe.Cmds[1:] {
		switch c.Args[0].Type() {
		case NodeBool, NodeDot, NodeNil, NodeNumber, NodeString:
			// With A|B|C, pipeline stage 2 is B
			t.errorf("non executable command in pipeline stage %d", i+2)
		}
	}
}

		{"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},
		{"NodeNumber", Const, 0},

pkg text/template/parse, const NodeAction NodeType
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 NodeBool = 2
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