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

From: Michael Heerdegen
Subject: bug#34852: 26.1; seq-intersection ignores nil as element
Date: Fri, 15 Mar 2019 00:15:20 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

"Miguel V. S. Frasson" <address@hidden> writes:

> Hi
> In any case, of another implementation for seq-intersection or not, I
> think that the solution from Stefan should be implemented anyway
> because
> * it makes seq-contains provide a useful return value when ELT=nil, so
> it is a good exception; If ELT=nil, seq-contains currently returns nil
> anyway;
> * it makes seq-contains become a real predicate function, making it
> more useful;
> * since seq-contains has been used as predicate before, it is
> unpredictable which code uses it out of official repositories, so this
> fix potentially fixes other code.

BTW, another (alternative) alternative would be to make it return
(list ELT).  That would be a bit less backward-compatible, but a
bit more consistent.


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