Re: Warn about comparing quoted lists (etc) using `eq`

[Dr. Arne Babenhauserheide]

Juanma Barranquero <lekktu@gmail.com> writes:

> Note that your patch has a false positive with the empty string, which is 
> optimized to be always the same object (well, ISTR there are two, a unibyte
> one and a multibyte one).
>
> (byte-compile '(let ((x "")) (eq x "")))   =>   Warning: `eq' called with 
> literal string that may never match (arg 2)
>
> (let ((x "")) (eq x "")) => t

Is this guaranteed or just an implementation detail?

If it is not guaranteed, then "may never match" sounds correct.

I miss a suggestion, though: the warning as it is is not actionable. It
would be great if it could say something along the lines of

"... (arg 2). Consider using `equal'."

Best wishes,
Arne
-- 
Unpolitisch sein
heißt politisch sein,
ohne es zu merken.
draketo.de

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