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drvfail015.hs:11:19: error:
• Illegal instance declaration for ‘Eq T’
(All instance types must be of the form (T t1 ... tn)
where T is not a synonym.
Use TypeSynonymInstances if you want to disable this.)
• In the stand-alone deriving instance for ‘Eq T’
drvfail015.hs:14:1: error:
• Can't make a derived instance of ‘Eq Handle’:
The data constructors of ‘Handle’ are not all in scope
so you cannot derive an instance for it
• In the stand-alone deriving instance for ‘Eq Handle’
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