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From: gah4 <gah4@u.washington.edu>
Newsgroups: comp.compilers
Subject: Re: Supporting multiple input syntaxes
Date: Sun, 23 Aug 2020 14:26:27 -0700 (PDT)
Organization: Compilers Central
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On Wednesday, August 12, 2020 at 3:32:56 PM UTC-7, luser droog wrote:
> I've got my project successfully parsing the circa-1975 C syntax
> from that old manual. I'd like to add parsers for K&R1 and c90
> syntaxes.

(snip)

I remember using  a later C compiler that accepted
the older form of assignment operators, such as =+, =-, etc.
Presumably for those with older code.

I then had to put an extra space when assigning negative values:

   i= -4;

I don't remember now how I found out about that one.

That is the only old C syntax I remember.
(And much later than 1975.)