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

[Juanma Barranquero]

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