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{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc8107", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  f = { mkDerivation, aeson, base, bytestring, cassava, conduit
      , containers, data-default-class, either, extra, fmt, http-media
      , lens, lib, monad-logger, mtl, path-pieces, persistent
      , persistent-postgresql, protocol-buffers
      , protocol-buffers-descriptor, regex-tdfa, resource-pool, servant
      , servant-docs, servant-server, servant-swagger, stm, swagger2
      , text, time, transformers, unliftio-core, uuid, vector
      , vector-algorithms, wai-extra, warp, zip-archive
      }:
      mkDerivation {
        pname = "tracktrain";
        version = "0.1.0.0";
        src = ./.;
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [
          aeson base bytestring cassava conduit containers either extra fmt
          http-media lens monad-logger mtl path-pieces persistent
          persistent-postgresql protocol-buffers protocol-buffers-descriptor
          regex-tdfa resource-pool servant servant-docs servant-server
          servant-swagger stm swagger2 text time transformers unliftio-core
          uuid vector vector-algorithms warp zip-archive
        ];
        executableHaskellDepends = [
          aeson base bytestring data-default-class fmt monad-logger
          persistent-postgresql protocol-buffers time wai-extra warp
        ];
        doHaddock = false;
        description = "tracktrain tracks trains on their traintracks";
        license = "unknown";
        hydraPlatforms = lib.platforms.none;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;

  drv = variant (haskellPackages.callPackage f {});

in

  drv # if pkgs.lib.inNixShell then drv.env else drv