bug#74771: Native compilation bug with struct predicates when lexical binding enabled (HEAD)

[Eric Marsden]

Hi,

With the attached source file, Emacs miscompiles the struct predicate such
that a repeated call to the predicate on a non-struct object returns t.
This occurs with current HEAD on Linux/AMD64, but not on the Emacs 30.0.92
pretest. It does not occur when the lexical binding cookie is not present.

% /opt/emacs/bin/emacs -Q --batch --eval "(load (native-compile 
\"/tmp/bug.el\"))" -f run
Loading 
/home/emarsden/.emacs.d/eln-cache/31.0.50-c021c983/bug-59c4b27c-c70072f9.eln 
(native compiled elisp)...
Running in GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.43, cairo version 1.18.2)
 of 2024-12-09
is? nil
is? t   ;; expecting nil
bar: 111

bug.el
Description: Text Data