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drvfail012.hs:5:33: error: [GHC-39999]
• Could not deduce ‘Eq (Ego a)’
arising from the 'deriving' clause of a data type declaration
from the context: Ord a
bound by the deriving clause for ‘Ord (Ego a)’
at drvfail012.hs:5:33-35
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Ord (Ego a))
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