boolean (ASTNode node) { ASTNode first = node.getFirstChildNode(); while (first != null && first.getTextLength() == 0) first = first.getTreeNext(); ASTNode last = node.getLastChildNode(); while (last != null && last.getTextLength() == 0) last = last.getTreePrev(); return first == null || last == null || isRaiseable(first) || isRaiseable(last); }