第二个all - strings函数生成了一个条件访问者，它将查找带有全部字符串参数的concat节点。
The second all-strings function similarly generates a conditional visitor that looks for a concat node with all string args.
第二个all - strings函数生成了一个条件访问者，它将查找带有全部字符串参数的concat节点。
The second all-strings function similarly generates a conditional visitor that looks for a concat node with all string args.
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