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T5287.hs:6:29:
No instance for (A e oops)
arising from the 'deriving' clause of a data type declaration
The type variable `oops' is ambiguous
Possible fix: add a type signature that fixes these type variable(s)
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
When deriving the instance for (Read (E e))
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