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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:
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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