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Inconveniently the Haskell package manager doesn't fricking work.

What… I don't understand what this very long error message is telling me. Do I need to upgrade Cabal? Do I need to downgrade Cabal? Is some existing package I have selected in a version incompatible with Idris? I can literally blow away my entire set of installed Haskell packages, I don't mind. Would that help? :(

EDIT: A six year old Google Groups comment reveals the secret is to pass cabal the flag "--allow-newer". Terrifying

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