Use of Double Semicolon (ANSI and GNU Common Lisp Document)

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#### 2.4.4.4 Use of Double Semicolon

Comments that begin with a double semicolon are all aligned to the same level of indentation as a form would be at that same position in the code. The text of such a comment usually describes the state of the program at the point where the comment occurs, the code which follows the comment, or both.