From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: "Mattias Engdegård" <mattias.engdegard@gmail.com>
Cc: Stefan Kangas <stefankangas@gmail.com>, 66816@debbugs.gnu.org
Subject: bug#66816: [PATCH] Delete redundant lambdas around unary functions
Date: Sun, 29 Oct 2023 17:55:27 -0400 [thread overview]
Message-ID: <jwvfs1tm71u.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <1F4EC90D-4A07-4B24-B699-5AC1CC6A8408@gmail.com> ("Mattias Engdegård"'s message of "Sun, 29 Oct 2023 20:03:16 +0100")
The patch looks good to me.
> We could also have the compiler η-reduce automatically. I investigated this
> very briefly some time ago. Maybe I can dig up the patch.
> One problem is that the arity isn't necessarily preserved.
And even if we check the arity before performing the rewrite, the arity
at compile-time may be different from the arity at run-time, so it's not
a safe optimization.
OTOH we could emit a warning :-)
> Most of the time this isn't a problem but it could be something to
> watch out for if doing the η-reduction by hand.
I've been bitten a few times, indeed.
Stefan
next prev parent reply other threads:[~2023-10-29 21:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-29 13:02 bug#66816: [PATCH] Delete redundant lambdas around unary functions Stefan Kangas
2023-10-29 19:03 ` Mattias Engdegård
2023-10-29 21:55 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2023-10-30 8:56 ` Mattias Engdegård
2023-10-30 15:00 ` Mattias Engdegård
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