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

[Random832]

Dmitry Gutov <dgutov@yandex.ru> writes:

> On 11/03/2015 09:54 PM, Random832 wrote:
>
>> 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.
>
> There's not much ideal about that. If we could get away with only
> canonicalizing file names, having to write comparison functions
> instead would involve an order of magnitude more code.

How are you going to canonicalize though?

Case as it exists on the filesystem? What if the file doesn't exist?

All upper or lower case? What if the file doesn't exist and the
"canonicalized" path is used to create it, contrary to the user's
intentions?

As it exists for what does exist, then as entered for components that
don't exist? What if the file is created with different cases
afterwards?