| 15 Sep 2025 |
 bglgwyng | {
packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
# it works
packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
# it works
packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
# it doesn't work
packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
};
Only the last one failed with 'error: function 'anonymous lambda' called without required argument 'testu01''
| 15:02:33 |
| bglgwyng | Here is the reproducer https://github.com/bglgwyng/haskellPackages-override | 15:02:59 |
| bglgwyng | * {
packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
# it works
packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
# it works
packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
# it doesn't work
packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
};
Only the last one failed with error: function 'anonymous lambda' called without required argument 'testu01'
| 15:03:21 |
| bglgwyng | I can see testu01 in the arguments of cabal2nix-splitmix, but somehow the override failed. | 15:04:08 |
 keypusher | I have a hard time getting protoc (on the PATH) while building a package with callCabal2Nix. It's used by cabal extension. | 15:20:20 |
| keypusher | Are there any tricks to troubleshooting that? | 15:21:06 |
 sterni | keypusher: cabal2nix does not really have the ability to do that automatically since Cabal does not allow specifying a dependency on a build tool that is not itself a Cabal package. You need to use addBuildTools or the like from haskell.lib.compose. | 15:32:07 |
| sterni | bglgwyng: on what system does packages.splitmix2 fail to evaluate? | 15:36:34 |
| keypusher | Oh ok. I tried googling "haskell.lib.compose addBuildtools" but came up a bit short. You don't happen to have some useful url? | 15:37:31 |
| keypusher | thanks btw! | 15:37:53 |
