标记练习 1.7 的错误状态，感谢 Sean 的提示：

http://sicp.readthedocs.org/en/latest/chp1/7.html#comment-657507692
go-to-win · Sep 21, 2012 · b43c049 · b43c049
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 练习 1.7
 =============
 
+.. warning:: 本题的实现有误，正等待修复。
+
 先将书本 16 页的 ``sqrt`` 函数完整敲下来：
 
 .. literalinclude:: code/p16-sqrt.scm