bug#21816: elisp-mode-tests fails on a case-preserving filesystem

[Random832 <random832@fastmail.com>]

Dmitry Gutov <dgutov@yandex.ru> writes:

> On 11/03/2015 06:53 PM, Eli Zaretskii wrote:
>
>> You mean, ref doesn't know that some strings are file names and some
>> aren't?  Then how does it know they are strings and not symbols or
>> something else?  This is Lisp, not C.
>
> Lisp has a "string" data type. It doesn't have a "file" data
> type. It's not Java.

Yes, but that means you should not have any places (variables,
parameters, parts of data structures) where you have a string that may
or may not be a file name with no way of knowing which you want.

Ideally, any data structure which can be compared and may contain a file
name should provide a comparison function which will, if it contains a
filename, compare the filenames with a filename comparison function.