anchor.diff:    inherit (releng_pkgs.pkgs) rustChannelOf bash autoconf213 clang_4 llvm_4 llvmPackages_4 gcc-unwrapped glibc fetchFromGitHub unzip zip openjdk python2Packages sqlite zlib;
     inherit (releng_pkgs.pkgs.devEnv) gecko;
   
  -  # Rust 1.29.1
  -  rustChannel' = rustChannelOf { date = "2018-09-25"; channel = "stable"; };
  +  # Rust 1.30.0
  +  rustChannel' = rustChannelOf { date = "2018-10-25"; channel = "stable"; };
     rustChannel = { inherit (rustChannel') cargo; rust = rustChannel'.rust.override { targets=["armv7-linux-androideabi"]; }; };
   
     # Add missing gcc libraries needed by clang (see https://github.com/mozilla/release-services/issues/1256)
  
positive.code: 
    # Mach needs 0.6.7 at least
    # From https://github.com/NixOS/nixpkgs/blob/cdf90258e6bf911db2b56280301014a88c91be65/pkgs/development/tools/rust/cbindgen/default.nix
    rustPlatform = mkRustPlatform {};
    rust-cbindgen =  rustPlatform.buildRustPackage rec {
      name = "rust-cbindgen-${version}";
      version = "0.6.7";
  
negative.code:     "
  
      # Use updated rust version
      echo "export PATH=${rust-cbindgen}/bin:${rustChannel.rust}/bin:${rustChannel.cargo}/bin:\$PATH" >> $geckoenv
    '';
    installPhase = ''
      geckoenv=$out/bin/gecko-env
  