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mod40.hs:3:1: error:
• Superclass cycle for ‘C1’
one of whose superclasses is ‘C2’
one of whose superclasses is ‘C1’
Use UndecidableSuperClasses to accept this
• In the class declaration for ‘C1’
mod40.hs:4:1: error:
• Superclass cycle for ‘C2’
one of whose superclasses is ‘C1’
one of whose superclasses is ‘C2’
Use UndecidableSuperClasses to accept this
• In the class declaration for ‘C2’
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