Re: A cute reader hack

Marcin 'Qrczak' Kowalczyk <qrczak@xxxxxxxxxx> writes:

Pascal Costanza <pc@xxxxxxxxx> writes:

No, but you can pass the following instead:

(lambda (&rest args)
(declare (dynamic-extent args))
(copy-list args))

What do you want to use this for?

You seem to have suggested to declare as dynamic-extent the &rest
parameter which is passed down to another function, irrespective
of how the other function is written (if "idiom" is understood as
"any code matching this pattern").

I was just worried that this optimization requires the knowledge about
the other function. In particular it would be unsafe with the _func
reader syntax that this thread is about, because the function might
return its original parameter list as a part of its result.

--
__("< Marcin Kowalczyk
\__/ qrczak@xxxxxxxxxx
^^ http://qrnik.knm.org.pl/~qrczak/

It is always unsafe to modify &rest arguments.

--
This is a song that took me ten years to live and two years to write.
- Bob Dylan
.

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