anchor.diff:  
       outputHashMode = "recursive";
       outputHashAlgo = "sha256";
  -    outputHash = if stdenv.isLinux && stdenv.isx86_64 then "0c02n779z4l7blzla5820bzfhblbp5nlizx9f8wns4miwnph357f"
  -    else if stdenv.isDarwin && stdenv.isx86_64 then "1gy5k9ii86rxyv2v9if4n1clvmb1hi4ym32mp6miwgcjla10sv30"
  +    outputHash = if stdenv.isLinux && stdenv.isx86_64 then "jqcecAM51qEDmTim2VBNm8IO8wQmwU19R57Zk4pxwSA="
  +    else if stdenv.isDarwin && stdenv.isx86_64 then "15m2rahf9kihw29hp6bwd9xqav6dcr17w5c2rsw0ijpchr2av72q"
       else throw "unsupported platform";
     };
   
  
positive.code: 
    bloop-fish = fetchurl {
      url = "https://github.com/scalacenter/bloop/releases/download/v${version}/fish-completions";
      sha256 = "oBKlzHa1fbzhf60jfzuXvqaUb/xuoLYawigRQQOCSN0=";
    };
  
    bloop-zsh = fetchurl {
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "bloop";
    version = "1.4.12";
  
    bloop-coursier-channel = fetchurl {
      url = "https://github.com/scalacenter/bloop/releases/download/v${version}/bloop-coursier.json";
      sha256 = "bf3uHuGfmJukf0Qeudv8ZXz/9Uql/qsmvPS0XBb7oTQ=";
    };
  
    bloop-bash = fetchurl {
  