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<no location info>: Warning:
-XGeneralizedNewtypeDeriving is not allowed in Safe Haskell; ignoring -XGeneralizedNewtypeDeriving
<interactive>:16:29:
Can't make a derived instance of ‛Op T2’:
‛Op’ is not a derivable class
Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
In the newtype declaration for ‛T2’
<interactive>:19:9:
Not in scope: data constructor ‛T2’
Perhaps you meant ‛T1’ (line 13)
<interactive>:22:4: Not in scope: ‛y’
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