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Optimise
member
and assoc
(etc) with constant empty list
* lisp/emacs-lisp/byte-opt.el (byte-optimize-assq): New. (byte-optimize-member, byte-optimize-assoc, byte-optimize-memq): When the list argument is constant nil, the result is always nil. * test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp-tests--test-cases): Add test cases.
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