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T13526.hs:21:8: warning: [-Wsimplifiable-class-constraints (in -Wdefault)]
• The constraint ‘C (Maybe a)’ matches
instance C a => C (Maybe a) -- Defined at T13526.hs:14:10
This makes type inference for inner bindings fragile;
either use MonoLocalBinds, or simplify it using the instance
• In the type signature: bar :: C (Maybe a) => a -> Maybe a
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