{ pkgs ? import <nixpkgs> {}
, ghc ? null #"ghc8102"
, withHoogle ? false
#, symantic-base ? null
}:
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=";
      }) {};
      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 = [
      hs.cabal-install
      hs.haskell-language-server
      hs.hpc
    ];
    buildInputs = [
      #hs.ghcid
      #hs.ormolu
      hs.hlint
      #pkgs.nixpkgs-fmt
    ];
    inherit withHoogle;
  };
}