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T8450.hs:8:20:
Couldn't match type ‛a’ with ‛Bool’
‛a’ is a rigid type variable bound by
the type signature for run :: a at T8450.hs:7:15
Expected type: Either Bool ()
Actual type: Either a ()
Relevant bindings include run :: a (bound at T8450.hs:8:1)
In the second argument of ‛($)’, namely
‛(undefined :: Either a ())’
In the expression: runEffect $ (undefined :: Either a ())
In an equation for ‛run’:
run = runEffect $ (undefined :: Either a ())
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