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T9201.hs:6:17: error:
• Expected kind ‘x’, but ‘a’ has kind ‘y’
‘y’ is a rigid type variable bound by
the class declaration for ‘MonoidalCCC’
at T9201.hs:5:20-49
‘x’ is a rigid type variable bound by
the class declaration for ‘MonoidalCCC’
at T9201.hs:5:20-49
• In the first argument of ‘f’, namely ‘a’
In the second argument of ‘d’, namely ‘(f a)’
In the type signature: ret :: d a (f a)
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