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bug#34852: 26.1; seq-intersection ignores nil as element


From: Stefan Monnier
Subject: bug#34852: 26.1; seq-intersection ignores nil as element
Date: Thu, 14 Mar 2019 17:43:16 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> If ELT=nil, seq-contains currently returns nil anyway;

That's true when `testfn` is nil, but not if you provide
your own `testfn`.


        Stefan





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