On 2016-09-12 21:48, Leo Liu wrote:
> On 2016-09-12 19:38 +0000, Tino Calancha wrote:
>> +  (image-dired--check-executable-exists
>> +   'image-dired-cmd-create-thumbnail-program)
> 
> Why not just 
> 
> (image-dired--check-executable-exists 
>   image-dired-cmd-create-thumbnail-program)
> 
> and change your image-dired--check-executable-exists accordingly?

I'd guess because the error message needs the name of the symbol.  Or were you suggesting to make image-dired--check-executable-exists a macro?

Clément.