How to setopt mm-inline-media-tests?

[Tomas Volf]

Hello,

I am trying to modify mm-inline-media-tests, but not matter what I do I cannot
get rid of following warning:

    [..] does not match type (repeat (list (regexp :tag MIME type) (function 
:tag Display function) (function :tag Display test)))

I even get this warning when I just set the variable to its default value
(executed under emacs -Q):

    (require 'mm-decode)
    (setopt mm-inline-media-tests mm-inline-media-tests)

Could someone please point me into the right direction what is the expected way
to modify the value without getting the warning?

Thank you,
Tomas Volf

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