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 2.3 Comments in `m4' input
 ==========================
 
 Comments in `m4' are normally delimited by the characters `#' and
 newline.  All characters between the comment delimiters are ignored,
 but the entire comment (including the delimiters) is passed through to
 the output--comments are _not_ discarded by `m4'.
 
    Comments cannot be nested, so the first newline after a `#' ends the
 comment.  The commenting effect of the begin-comment string can be
 inhibited by quoting it.
 
      `quoted text' # `commented text'
      =>quoted text # `commented text'
      `quoting inhibits' `#' `comments'
      =>quoting inhibits # comments
 
    The comment delimiters can be changed to any string at any time,
 using the builtin macro `changecom'.   Changecom, for more
 information.
 
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