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

From: Basil L. Contovounesios
Subject: bug#34852: 26.1; seq-intersection ignores nil as element
Date: Thu, 14 Mar 2019 17:02:22 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Michael Heerdegen <address@hidden> writes:

> "Basil L. Contovounesios" <address@hidden> writes:
>> My first patch makes an analogous backward-compatible change using the
>> more efficient seq-position in place of seq-some.
> Why is it more efficient?  The implementations are more or less
> analogue, with the exception that seq-position additionally increments a
> counter.

Because seq-some involves an additional level of function indirection.
This is confirmed by profiling and the attached mini-benchmark, when run
as follows:

emacs -batch -f batch-byte-compile bench.el
emacs -script bench.elc

A call to seq-position is also less verbose than one to seq-some for the
purpose of finding an element of a sequence.

Having said that, the differences are obviously very small.


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