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tcfail223.hs:10:10: error:
• Could not deduce ‘Class1 a’
arising from the superclasses of an instance declaration
from the context: Class3 a
bound by the instance declaration at tcfail223.hs:10:10-29
Possible fix:
add (Class1 a) to the context of the instance declaration
• In the instance declaration for ‘Class2 a’
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