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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>:6:10-23
• In the expression: a
In the expression: [a, b]
In an equation for ‘asList’: asList (a, b) = [a, b]
• 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)
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