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T2534.hs:3:19:
Couldn't match expected type ‘a -> a -> b’ with actual type ‘[t0]’
Relevant bindings include
foo :: a -> a -> b (bound at T2534.hs:3:1)
In the second argument of ‘foldr’, namely ‘[]’
In the expression: foldr (>>=) [] []
In an equation for ‘foo’: foo = foldr (>>=) [] []
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