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Roles10.hs:16:12:
Could not coerce from ‛Bool’ to ‛Char’
because ‛Bool’ and ‛Char’ are different types.
arising from the coercion of the method ‛meth’ from type
‛Int -> F Int’ to type ‛Age -> F Age’
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
When deriving the instance for (C Age)
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