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Programming in Emacs Lisp

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The next expression in the outer while loop is an if expression. The Lisp interpreter evaluates the then-part of the if when the fill-prefix-regexp variable has a value other than nil, and it evaluates the else-part when the value of if fill-prefix-regexp is nil, that is, when there is no fill prefix.

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  Copyright 2003   by The Free Software Foundation     Updated Jun 2003