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T17567StupidTheta.hs:1:37: warning: [GHC-53692] [-Wdeprecated-flags (in -Wdefault)]
-XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.
T17567StupidTheta.hs:6:1: error: [GHC-16220]
⢠Uninferrable type variable k0 in
the datatype context:
forall (a :: k -> k0). (a b :: k0) ~ (a c :: k0)
⢠In the data declaration for âTâ
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