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RepPolyCase2.hs:33:7: error: [GHC-55287]
• The scrutinee of the case statement
does not have a fixed runtime representation.
Its type is:
Unbox Int :: TYPE (Rep Int)
• In the expression: case unbox (3 :: Int) of _ -> ()
In an equation for ‘x’: x _ = case unbox (3 :: Int) of _ -> ()
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