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Comments
========
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 begin comment character can be included in the input by
quoting it.
The comment delimiters can be changed to any string at any time,
using the built-in macro `changecom'. Changecom for more
information.