Done. Hydra - nixpkgs:haskell-updates now builds the haskell-updates branch from the main Nixpkgs repository and updates are pushed there once a day, too. Case in point: LTS 12.2 came out just a few hours ago. Hydra - Evaluation 1470385 of jobset nixpkgs:haskell-updates is the first evaluation that uses the new version.
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