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Re: Should undefined behavior be encouraged in Emacs?


From: Stefan Monnier
Subject: Re: Should undefined behavior be encouraged in Emacs?
Date: Mon, 03 Oct 2011 09:16:42 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.90 (gnu/linux)

> I don't know about convenient error-*handling*, but if Stefan wants to
> prevent people from using the value of primitives called only for

This is Elisp we're talking about: no types, no "preventing people".
There's only positive/negative encouragement.

> side-effects, he can always provide "convenient error generation" by
> having such primitives return Qunbound (or whatever it's called in

If the Qunbound value escapes to Elisp I'm sure we'll get bug reports.


        Stefan



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