anchor.diff:        sha256 = "6649ec545093be46ebf2bf2d76e4b67597b2c92ea9ad80fe354db130994de45e";
       };
     };
  +  dottyLocal = stdenv.mkDerivation {
  +    name = "dotty-local";
  +    buildInputs =  [ ];
  +    builder = builtins.toFile "builder.sh" ''
  +      source $stdenv/setup
  +      mkdir -p $out/bin
  +      tar zxvf $src -C $out/
  +      ln -sf $out/dotty-* $out/dotty
  +      ln -sf $out/dotty/bin/* $out/bin/
  +    '';
  +    src = fetchurl {
  +      url = https://github.com/lampepfl/dotty/releases/download/0.3.0-RC2/dotty-0.3.0-RC2.tar.gz;
  +      sha256 = "1359843e19ac25b1dc465bfb61d84aeb507476bca57a46d90a111454e123ab29";
  +    };
  +  };
   in { scalaEnv = buildEnv {
     name = "scala-env";
     paths = [
  
positive.code:     ideaLocal
      less
      libunwind
      nodejs
      openjdk
      openssh
  
negative.code:     boehmgc
      clang
      docker
      dottyLocal # (Tentative Scala 3 compiler)
      dbus # needed non-explicitly by vscode
      emacs
      git
  