Re: Why are there two dolist?

[Miles Bader <miles@gnu.org>]

Lennart Borgman <lennart.borgman@gmail.com> writes:
>> Most people will never see the cl-macs version; those who _should_ see
>> it will, because they'll have done (require 'cl) first; since the
>> cl-macs version supports the basic subr.el usage, it's OK if some code
>> that doesn't need the extra features ends up se
>
> Does not this open to subtle bugs?

I think it's such a simple macro (at least the basic subr.el version is) that
this isn't such a big problem.

> Would it not be better to move the cl-macs.el version to subr.el?

I haven't looked at the code (recently), but because elisp doesn't
natively support lexical blocks, I suspect the cl-macs version either
(1) adds unnecessary runtime overhead, or (2) drags in lots of big and
crufty compile-time analysis code (cl.el has lots of this) to optimize
away the block when not used.

-miles

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