GHC-8.0 emits several new warnings of this kind:

   Defined but not used: type variable ‘x’

for declarations like

   type instance Snd x y = y

Enthusiastically, I started to replace unused type function arguments by underscores, only to find out that older GHC versions do not accept that. With what option can I disable this warning? Or can it be removed from -Wall for now?
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