message: more profiling tools
diff: @@ -8,10 +8,13 @@ stdenv.mkDerivation rec {
  pkgs.rustfmt
  pkgs.openssl
  pkgs.pkg-config
  - pkgs.gperftools
  python37Packages.numpy
  python37Packages.ipython
  python37Packages.virtualenv
  + # profiling and visualization
  + pkgs.gperftools
  + pkgs.graphviz
  + pkgs.gv
  ];
  RUST_BACKTRACE = 1;
  src = null;
  