anchor.diff:  
     bloop-fish = fetchurl {
       url = "https://github.com/scalacenter/bloop/releases/download/v${version}/fish-completions";
  -    sha256 = "oBKlzHa1fbzhf60jfzuXvqaUb/xuoLYawigRQQOCSN0=";
  +    sha256 = "eFESR6iPHRDViGv+Fk3sCvPgVAhk2L1gCG4LnfXO/v4=";
     };
   
     bloop-zsh = fetchurl {
  
positive.code: 
      outputHashMode = "recursive";
      outputHashAlgo = "sha256";
      outputHash = if stdenv.isLinux && stdenv.isx86_64 then "0c02n779z4l7blzla5820bzfhblbp5nlizx9f8wns4miwnph357f"
      else if stdenv.isDarwin && stdenv.isx86_64 then "1gy5k9ii86rxyv2v9if4n1clvmb1hi4ym32mp6miwgcjla10sv30"
      else throw "unsupported platform";
    };
  
  
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 {
  