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T11128b.hs:40:5: warning: [-Wnoncanonical-monadfail-instances]
Noncanonical ‘fail’ definition detected
in the instance declaration for ‘Monad T1’.
Either remove definition for ‘fail’ or define as ‘fail = Control.Monad.Fail.fail’
T11128b.hs:43:5: warning: [-Wnoncanonical-monadfail-instances]
Noncanonical ‘fail = Control.Monad.fail’ definition detected
in the instance declaration for ‘MonadFail T1’.
Move definition from ‘Control.Monad.fail’ to ‘fail’
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