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T5287.hs:6:10:
Could not deduce (A a oops0)
arising from the ambiguity check for an instance declaration
from the context (A a oops)
bound by an instance declaration: A a oops => Read (D a)
at T5287.hs:6:10-31
The type variable ‛oops0’ is ambiguous
In the ambiguity check for: forall a oops. A a oops => Read (D a)
In the instance declaration for ‛Read (D a)’
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