Getting a shell with nix develop fails with an error

[ghost]

I would like to add Hoogle as you've described in the docs, but I can't seem to get a shell even without it... here's the basic flake I'm using and the error output. I'm not sure why that error is happening.

Flake:

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    haskell-flake.url = "github:srid/haskell-flake";
  };
  outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = nixpkgs.lib.systems.flakeExposed;
      imports = [ inputs.haskell-flake.flakeModule ];

      perSystem = { self', pkgs, ... }: {
        haskellProjects.default = {
          basePackages = pkgs.haskell.packages.ghc96;

          devShell = {
            tools = hp: {
              ghcid = null;
              hlint = null;
            };
          };
        };
        packages.default = self'.packages.puzzle;
      };
    };
}

Error:

error: builder for '/nix/store/i0llm9kh78qagqg5vj824r778y8in7h0-hourglass-0.2.12.drv' failed with exit code 1;
       last 10 log lines:
       > tests/Tests.hs:213:24: error: [GHC-76037]
       >     Not in scope: ‘T.parseTime’
       >     NB: neither ‘System.Locale’, ‘Data.Time.Calendar’,
       >                 ‘Data.Time.Clock’,
       >                 ‘Data.Time.Clock.POSIX’ nor ‘Data.Time.Format’ export ‘parseTime’.
       >     Suggested fix:
       >       Perhaps use ‘T.parseTimeM’ (imported from Data.Time.Format)
       >     |
       > 213 |                 md2  = T.parseTime T.defaultTimeLocale fmt "%F"
       >     |                        ^^^^^^^^^^^
       For full logs, run 'nix log /nix/store/i0llm9kh78qagqg5vj824r778y8in7h0-hourglass-0.2.12.drv'.
error: 1 dependencies of derivation '/nix/store/2xj3dih0wapsy74h08b3mzg079fj1kd0-asn1-encoding-0.9.6.drv' failed to build
error: 1 dependencies of derivation '/nix/store/8w2vlczzb7iyjld01jsynwz969p5sbxp-asn1-types-0.3.4.drv' failed to build
error: 1 dependencies of derivation '/nix/store/08ar5m2pnx88bwniplwgi911j2bw87k0-tls-1.5.8.drv' failed to build
error: 1 dependencies of derivation '/nix/store/802q90bwzg4ri20wphs7d67d6znlxfad-x509-1.7.7.drv' failed to build
error: 1 dependencies of derivation '/nix/store/370w7wvx1lp2pcf0mxmagz9l0zv4in2v-connection-0.3.1.drv' failed to build
error: 1 dependencies of derivation '/nix/store/8klvxbzpqqnsciig6hsmjjcnccg747av-http-client-tls-0.3.6.1.drv' failed to build
error: 1 dependencies of derivation '/nix/store/yj397g3cdvyy622cxaq429liridn3c6x-hoogle-5.0.18.3.drv' failed to build
error: 1 dependencies of derivation '/nix/store/gsx6694zzx0gav65km3kqvfy1zpm2hl2-hoogle-with-packages.drv' failed to build
error: 1 dependencies of derivation '/nix/store/b2yl2jgy9c3fjgp4giqbhrvr3rwk89sd-ghc-9.6.1-with-packages.drv' failed to build
error (ignored): error: cannot unlink '/tmp/nix-build-prettyprinter-1.7.1.drv-0/prettyprinter-1.7.1/dist/build': Directory not empty
error: 1 dependencies of derivation '/nix/store/2mszj2hncgkdcz6s7975vvmsdw6kmc91-ghc-shell-for-puzzle-0.1.0.0-0-env.drv' failed to build

[srid]

You are using a non-default package set (pkgs.haskell.packages.ghc96), so these errors are expected. haskell-flake includes hoogle by default:

haskell-flake/nix/haskell-project.nix

Line 57 in c74e7c5

withHoogle = true;

I suppose we should allow it to be disabled by the user if you don't particularly care about hoogle. That said, you are likely to hit another compile error somewhere. When you use a non-default GHC, you should be prepared to write a lot of overrides:

• https://haskell.flake.page/dependency
• https://github.com/nammayatri/common/blob/main/nix/ghc810.nix

[ghost]

Oh, I see. I think haskell.nix does a lot of this overriding for the user, but I'll just use the default packages for now. (Example: https://github.com/input-output-hk/haskell.nix/blob/master/materialized/ghc927/cabal-install/default.nix). Got it working with default. Thanks.