m4: Comments

1 
1 3.3 Comments in 'm4' input
1 ==========================
1 
1 Comments in 'm4' are normally delimited by the characters '#' and
1 newline.  All characters between the comment delimiters are ignored, but
1 the entire comment (including the delimiters) is passed through to the
1 output--comments are _not_ discarded by 'm4'.
1 
1    Comments cannot be nested, so the first newline after a '#' ends the
1 comment.  The commenting effect of the begin-comment string can be
1 inhibited by quoting it.
1 
1      $ m4
1      `quoted text' # `commented text'
1      =>quoted text # `commented text'
1      `quoting inhibits' `#' `comments'
1      =>quoting inhibits # comments
1 
1    The comment delimiters can be changed to any string at any time,
1 using the builtin macro 'changecom'.  ⇒Changecom, for more
1 information.
1