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bug#29866: 27.0.50; cl-loop: Calculate the array length just once


From: Tino Calancha
Subject: bug#29866: 27.0.50; cl-loop: Calculate the array length just once
Date: Thu, 28 Dec 2017 06:36:55 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)



On Wed, 27 Dec 2017, Stefan Monnier wrote:

X-Debbugs-CC: address@hidden

Thanks.

It looks sensible to calculate the array length just once,
instead of recalculate it on each iteration:

I tend to agree, but I don't know very much about the intended semantics
of Common Lisp's `loop` macro, nor about cl-loop's implementation (tho
I admit I did mess with it without being really sure what I was doing).
While studying this code I found easier to hack if we use gensym's
instead of make-symbol; otherwise, the code creates several symbols with
the same printed representation "--cl-var--". For example, with current code you can read expansions with something like:

(let* ((--cl-var-- 'foo)
       (--cl-var-- 'bar))

I prefer to read:

(let* ((--cl-var--1 'foo)
       (--cl-var--2 'bar))

Do you have any preference in these cases?





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