func (n *ForStmt) AddChild(node Node) {
	n.ChildNodes = append(n.ChildNodes, node)
}
AddChild adds a new child node. Child nodes can then be accessed with the
Children attribute.
package ast
type ForStmt struct {
	Addr       Address
	Pos        Position
	ChildNodes []Node
}
func parseForStmt(line string) *ForStmt {
	groups := groupsFromRegex(
		"<(?P<position>.*)>",
		line,
	)
	return &ForStmt{
		Addr:       ParseAddress(groups["address"]),
		Pos:        NewPositionFromString(groups["position"]),
		ChildNodes: []Node{},
	}
}