Re: [PATCH 0/3] yacc: compute the best type for the state number

[Paul Eggert]

> > The C Standard doesn't guarantee support for -128 and -32768. This originally 
> > was for ones' complement machines such as the Unisys ClearPath Dorado 
> > enterprise servers (still in use via firmware translation to Intel Xeon, and 
> > they have a C compiler),
>
> Are they still used in production for programs written in C?

Yes, it does appear C is still active there; Unisys has a C reference manual 
dated 2015 
<https://public.support.unisys.com/aseries/docs/clearpath-mcp-17.0/pdf/86002268-206.pdf> 
and they're still selling those mainframes with new hardware released this year 
<https://www.app5.unisys.com/library/gmMail/emails/documents/CP-June19/poweredby_june2019.html>.

PS. They also support Cobol, Fortran, and some other languages. (The world is 
still waiting patiently for Bison to support Cobol. :-)