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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
Comments cannot be nested, so the first newline after a `#' ends the comment. The commenting effect of the begin comment character can be inhibited by quoting it.
The comment delimiters can be changed to any string at any time, using
the builtin macro
changecom. See section 7.3 Changing comment delimiters for more
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