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T17963.hs:15:23: error:
• Couldn't match a lifted type with an unlifted type
‘rep1’ is a rigid type variable bound by
the class declaration for ‘Category'’
at T17963.hs:13:27-29
When matching kinds
k0 :: *
ob :: TYPE rep1
Expected kind ‘ob’, but ‘a’ has kind ‘k0’
• In the first argument of ‘cat’, namely ‘a’
In the type signature: id' :: forall a. cat a a
In the class declaration for ‘Category'’
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