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T5978.hs:22:11: error: [GHC-18872]
• Couldn't match type ‘Bool’ with ‘Char’
arising from a functional dependency between:
constraint ‘C Double Char’ arising from a use of ‘polyBar’
instance ‘C Double Bool’ at T5978.hs:8:10-22
• In the expression: polyBar id monoFoo
In an equation for ‘monoBar’: monoBar = polyBar id monoFoo
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