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let H =
https://gitlab.horizon-haskell.net/dhall/horizon-spec/-/raw/0.10.0/horizon-spec/package.dhall
let packages =
{ formatting = H.callHackage "formatting" "7.2.0"
, polysemy = H.callHackage "polysemy" "1.9.1.0"
, recursion-schemes = H.callHackage "recursion-schemes" "5.2.2.4"
, type-errors = H.callHackage "type-errors" "0.2.0.2"
, unagi-chan = H.callHackage "unagi-chan" "0.4.1.4"
}
in H.HorizonExport.MakeOverlay
{ overlayFile = "overlay.nix"
, packagesDir = "pkgs/"
, overlay = { compiler = "ghc-9.7", packages = toMap packages }
}