tvl-depot/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 ];
nix-diff = overrideSrc hsSuper.nix-diff {
src = builtins.fetchTarball {
# https://github.com/Gabriel439/nix-diff/pull/50
url = "https://github.com/Profpatsch/nix-diff/archive/6234936b26cd144d321039a44cf1791dcfaee026.tar.gz";
sha256 = "1i3ahh8jmiayf29i1xrl2n1dkldgdmrllmccxi4yx6hbcd0r2b1l";
};
};
};
in {
haskellPackages = super.haskellPackages.override {
inherit overrides;
};
}