On 8 Jan 2020, at 16:02, Clem Cole <clemc@ccc.com> wrote:

below...  -- warning veering a little from pure UNIX history, but trying to clarify what I can and then moving to COFF for follow up.

On Wed, Jan 8, 2020 at 12:23 AM Brian Walden <tuhs@cuzuco.com> wrote:

....

- CMU's ALGOL68S from 1978 list all these ways --
  co            comment
  comment       comment
  pr            pragmat
  pragmat       pragmat

I remember that a pragma (at least in Algol68R (ICL 1900 series) and I would need to reread the formal definition to see if it was general) was not a comment.

It was a note to the compiler - which could choose to use it or lose it.

  #             (comment symbol) comment
  ::            (pragmat symbol) pragmat
  (its for UNIX v6 or v7 so not surprising # is a comment)
  http://www.softwarepreservation.org/projects/ALGOL/manual/a68s.txt/view