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non-nil not valid any more?

From: Andreas Röhler
Subject: non-nil not valid any more?
Date: Thu, 11 Jun 2020 18:54:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 
Hi,

IIRC it was possible to write something like

(if non-nil (message "%s" "Wahr")(message "%s" "Falsch"))

Now get

Debugger entered--Lisp error: (void-variable non-nil)
GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32, cairo version 1.16.0) of 2020-06-10 

Thanks,
Andreas
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