Nnewtypenewtype Fail aPeek#ConstructorsFailrunFail :: Either String aInstances4Monad, Functor, MonadFail, ApplicativeMonad FailDefined in Agda-2.8.0.2 · Agda.Utils.FailFunctor FailDefined in Agda-2.8.0.2 · Agda.Utils.FailMonadFail FailDefined in Agda-2.8.0.2 · Agda.Utils.FailApplicative FailDefined in Agda-2.8.0.2 · Agda.Utils.Fail