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T11514.hs:6:7: error:
• Couldn't match expected type ‘(Show a => a -> a) -> ()’
with actual type ‘a0’
Cannot instantiate unification variable ‘a0’
with a type involving polytypes: (Show a => a -> a) -> ()
• In the expression: undefined
In an equation for ‘foo’: foo = undefined
• Relevant bindings include
foo :: (Show a => a -> a) -> () (bound at T11514.hs:6:1)
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