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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: What is the Emacs "nonportable dumper" catastrophe?
Date: Tue, 10 Sep 2019 05:35:00 +0300
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 (message from Jeffrey Walton on Mon, 9 Sep 2019 21:44:12 -0400)
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> From: Jeffrey Walton <noloader@gmail.com>
> Date: Mon, 9 Sep 2019 21:44:12 -0400
> 
>     There's never been a LISP compiler. LISP "compilers"
>     just dump memory. See the Emacs "nonportable dumper"
>     catastrophe that was only fixed in the last couple years.
> 
> What is the catastrophe that was fixed?

See the description of portable dumper in NEWS.  The description of
the previous dumping as "catastrophe" is a wild exaggeration, IMNSHO.