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nixpkgs/pkgs/development/haskell-modules/default.nix

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Nix

{ pkgs, stdenv, ghc, all-cabal-hashes
, compilerConfig ? (self: super: {})
, packageSetConfig ? (self: super: {})
, overrides ? (self: super: {})
, initialPackages ? import ./hackage-packages.nix
}:
let
inherit (stdenv.lib) extends makeExtensible;
inherit (import ./lib.nix { inherit pkgs; }) overrideCabal makePackageSet;
haskellPackages = makePackageSet {
package-set = initialPackages;
inherit ghc extensible-self;
};
commonConfiguration = import ./configuration-common.nix { inherit pkgs; };
nixConfiguration = import ./configuration-nix.nix { inherit pkgs; };
extensible-self = makeExtensible
(extends overrides
(extends packageSetConfig
(extends compilerConfig
(extends commonConfiguration
(extends nixConfiguration haskellPackages)))));
in
extensible-self