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T8984.hs:7:46: error: [GHC-18872]
• Couldn't match representation of type: cat a (N cat a Int)
with that of: cat a (cat a Int)
arising from the coercion of the method ‘app’
from type ‘cat a (cat a Int)’ to type ‘N cat a (N cat a Int)’
NB: We cannot know what roles the parameters to ‘cat a’ have;
we must assume that the role is nominal
• When deriving the instance for (C (N cat a))
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