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T7279.hs:6:10:
Could not deduce (Show b0)
arising from the ambiguity check for an instance declaration
from the context (Eq a, Show b)
bound by an instance declaration: (Eq a, Show b) => Eq (T a)
at T7279.hs:6:10-35
The type variable `b0' is ambiguous
In the ambiguity check for: forall a b. (Eq a, Show b) => Eq (T a)
In the instance declaration for `Eq (T a)'
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