Ar an naoú lá déag de mí Méan Fómhair, scríobh Stephen J. Turnbull:
[...] I would appreciate it if you'd take a little time on this
log message. I've often wanted that optimization myself (more for style,
the "(delq nil ...)" is just ugly), and you have made it systematic here.
It would be nice if other people could pick up your idea and use it
correctly without having to think carefully about it!
Nothing original to me, it’s documented here:
in the CL HyperSpec. It’s not used much in emacs Lisp because #'mapcan at
runtime isn’t halaal for GNU.
“Apart from the nine-banded armadillo, man is the only natural host of
Mycobacterium leprae, although it can be grown in the footpads of mice.”
-- Kumar & Clark, Clinical Medicine, summarising improbable leprosy research
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