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T12918a.hs:8:11: error: [GHC-72771]
• The default type signature for fresh:
forall (t :: (* -> *) -> * -> *). MonadTrans t => t m Integer
does not match its corresponding non-default type signature
• When checking the class method:
fresh :: forall (m :: * -> *). MonadSupply m => m Integer
In the class declaration for ‘MonadSupply’
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