{ pkgs ? import <nixpkgs> {}
, ghc ? "ghc901"
, withHoogle ? false
}:
let
  haskellPackages =
    if ghc == null
    then pkgs.haskellPackages
    else pkgs.haskell.packages.${ghc};
  hs = haskellPackages.extend (with pkgs.haskell.lib;
    hself: hsuper: {
      /*
      mkDerivation = drv: hsuper.mkDerivation (
        # There is no much cache for other ghc,
        # hence build as little as possible.
        drv // pkgs.lib.optionalAttrs (ghc != null) {
          enableLibraryProfiling = false;
          doHaddock = false;
          doBenchmark = false;
          doCoverage = false;
          doHoogle = false;
          #doCheck = false;
          # Enable check here so that symantic-parser.getCabalDeps contains testHaskellDepends,
          # which are needed in the shell to run:
          # cabal repl --enable-tests symantic-parser-test
          # Wrapping symantic-parser in a doCheck (hence using overrideCabal) would not work.
          # And I have no idea why the version suffix must also be included.
          doCheck = builtins.match "symantic-parser.*" drv.pname != null;
        }
      );
      */
      /*
      symantic-base = hself.callCabal2nix "symantic-base" (pkgs.fetchgit {
        url = "git://git.sourcephile.fr/haskell/symantic-base";
        sha256 = "sha256-I636Kl+S93BDX1xrEMQdf217pLeT6FeF4BBpj83sEgQ=";
      }) {};
      */
      # Relax upper bound to support ghc-9.0.1
      /*
      bifunctors = doJailbreak hsuper.bifunctors;
      attoparsec = doJailbreak hsuper.attoparsec;
      assoc = doJailbreak hsuper.assoc;
      vector-binary-instances = doJailbreak hsuper.vector-binary-instances;
      vector-th-unbox = doJailbreak hsuper.vector-th-unbox;
      these = doJailbreak hsuper.these;
      quickcheck-instances = doJailbreak hsuper.quickcheck-instances;
      binary-orphans = doJailbreak hsuper.binary-orphans;
      text-short = doJailbreak hsuper.text-short;
      aeson = doJailbreak hsuper.aeson;
      */
      #HsYAML = doJailbreak hsuper.HsYAML;
      #gitrev = doJailbreak hsuper.gitrev;
      #ghc-source-gen = doJailbreak hsuper.ghc-source-gen;
      data-fix = doJailbreak hsuper.data-fix;
      primitive = doJailbreak hsuper.primitive;
      assoc = doJailbreak hsuper.assoc;
      these = doJailbreak hsuper.these;
      dump-core = dontCheck (unmarkBroken hsuper.dump-core);

      symantic-parser = enableExecutableProfiling (doCheck (
        hself.callCabal2nix "symantic-parser" ./. {}));
    } //
    packageSourceOverrides {
      # symantic-parser = ./.;
    } hself hsuper
  );
in hs.symantic-parser // {
  shell = hs.shellFor {
    packages = p: [ p.symantic-parser ];
    nativeBuildInputs = [
      pkgs.cabal-install
      #hs.cabal-install
      #hs.haskell-language-server
      #hs.hpc
    ];
    buildInputs = [
      #hs.ghcid
      #hs.ormolu
      #hs.hlint
      #pkgs.nixpkgs-fmt
    ];
    inherit withHoogle;
  };
}