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From: Lars Brinkhoff <lars@nocrew.org>
To: "Steve Johnson" <scj@yaccman.com>
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Date: Mon, 29 Oct 2018 07:31:24 +0000
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 (Steve Johnson's message of "Sun, 28 Oct 2018 20:00:42 -0700")
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Subject: Re: [TUHS] Archaic yacc C grammar
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Steve Johnson wrote:
> Looking at the reserved words, there is one, ENTRY, that I've never
> heard of (although FORTRAN had an ENTRY statement), and there is
> STRUCT but no UNION. Also, he uses val= instead of $$=. There don't
> seem to be any nontrivial assignment ops (neither += or =+).

This is for Snyder's C compiler.  There is something called =op which
is guess is for =+ etc.

> I'm guessing either Al wrote it from scratch or based it on some other
> similar program.

Looks like you're right.  I found this in another file, so it would seem
he wrote it back at MIT:

  "The original YACC was designed and implemented on a PDP-11/45 and a
  Honeywell 6000 by S. C. Johnson at Bell Laboratories.  The version
  described in this paper was implemented on the PDP-10 by Alan Snyder.