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drvfail015.hs:10:19:
Illegal instance declaration for `Eq T'
(All instance types must be of the form (T t1 ... tn)
where T is not a synonym.
Use -XTypeSynonymInstances if you want to disable this.)
In the stand-alone deriving instance for `Eq T'
drvfail015.hs:13:1:
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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