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T5287.hs:6:10: error:
• Could not deduce (A a oops0)
from the context: A a oops
bound by an instance declaration:
forall a oops. A a oops => Read (D a)
at T5287.hs:6:10-31
The type variable ‘oops0’ is ambiguous
• In the ambiguity check for an instance declaration
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the instance declaration for ‘Read (D a)’
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