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drvfail014.hs:8:28:
Use deriving( Typeable ) on a data type declaration
In the data declaration for ‛T1’
drvfail014.hs:12:1:
Derived Typeable instance must be of form (Typeable2 T2)
In the stand-alone deriving instance for
‛(Typeable a, Typeable b) => Typeable (T2 a b)’
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