third_party/overlays/haskell/default.nix


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# Defines an overlay for overriding Haskell packages, for example to
# avoid breakage currently present in nixpkgs or to modify package
# versions.

{ lib, ... }:

self: super: # overlay parameters for the nixpkgs overlay

let
  overrides = hsSelf: hsSuper: with super.haskell.lib; {
    generic-arbitrary = appendPatch hsSuper.generic-arbitrary
      [ ./patches/generic-arbitrary-export-garbitrary.patch ];
  };
in
{
  haskellPackages = super.haskellPackages.override {
    inherit overrides;
  };
}