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<interactive>:6:49: error:
Couldn't match expected type ‘ListableElem (a, a)’
with actual type ‘a’
‘a’ is a rigid type variable bound by
the instance declaration at <interactive>:6:10
Relevant bindings include
b :: a (bound at <interactive>:6:43)
a :: a (bound at <interactive>:6:41)
asList :: (a, a) -> [ListableElem (a, a)]
(bound at <interactive>:6:33)
In the expression: a
In the expression: [a, b]
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