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tcfail020.hs:10:10:
Could not deduce (A [a])
arising from the superclasses of an instance declaration
from the context (A a)
bound by the instance declaration at tcfail020.hs:10:10-23
Possible fix:
add (A [a]) to the context of the instance declaration
or add an instance declaration for (A [a])
In the instance declaration for `B [a]'
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