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From: Lars Brinkhoff <lars@nocrew.org>
To: Warner Losh <imp@bsdimp.com>
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Date: Tue, 30 Oct 2018 08:16:17 +0000
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 (Warner Losh's message of "Mon, 29 Oct 2018 12:37:31 -0600")
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Subject: Re: [TUHS] Archaic yacc C grammar
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Warner Losh wrote:
> Steve Johnson wrote:
>  We actually had a pretty good system for making changes like
>  that. First, we would change the compiler to accept both the old and
>  the new. Then we would produce a warning that on a particular date
>  the old would no longer work. Then we made the old an error and
>  printed a message about how to fix it.
>
> How long a transition period did you typically have?

I heard the V7 compiler still supports old B style initialization
"int x 42;".  So in some cases, a really long time.