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<interactive>:6:49:
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
asList :: (a, a) -> [ListableElem (a, a)]
(bound at <interactive>:6:33)
a :: a (bound at <interactive>:6:41)
b :: a (bound at <interactive>:6:43)
In the expression: a
In the expression: [a, b]
In an equation for `asList': asList (a, b) = [a, b]
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