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T17841.hs:7:40: error:
• Couldn't match kind ‘k’ with ‘*’
‘k’ is a rigid type variable bound by
the class declaration for ‘Foo’
at T17841.hs:7:17
When matching kinds
k0 :: *
t :: k
Expected kind ‘t’, but ‘a’ has kind ‘k0’
• In the first argument of ‘Proxy’, namely ‘(a :: t)’
In the type signature: foo :: Proxy (a :: t)
In the class declaration for ‘Foo’
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