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(emacs-lisp-intro.info)fwd-para with fill prefix

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With a fill prefix
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   The inner `if' expression just discussed is the else-part of an
enclosing `if' expression which tests whether there is a fill prefix.
If there is a fill prefix, the then-part of this `if' is evaluated.  It
looks like this:

     (while (and (not (eobp))
                 (not (looking-at paragraph-separate))
                 (looking-at fill-prefix-regexp))
       (forward-line 1))

What this expression does is move point forward line by line so long as
three conditions are true:

  1. Point is not at the end of the buffer.

  2. The text following point does not separate paragraphs.

  3. The pattern following point is the fill prefix regular expression.

   The last condition may be puzzling, until you remember that point was
moved to the beginning of the line early in the `forward-paragraph'
function.  This means that if the text has a fill prefix, the
`looking-at' function will see it.