anchor.diff:        # Update rust to latest stable
         rustChannel.rust
         rustChannel.cargo
  +      rust-cbindgen
       ];
   })
  
positive.code:     "${gcc-unwrapped}/include/c++/${gcc-unwrapped.version}/x86_64-unknown-linux-gnu"
      "${glibc.dev}/include"
    ];
  
  in gecko.overrideDerivation (old: {
    # Dummy src, cannot be null
  
negative.code: { releng_pkgs }:
  
  let
    inherit (releng_pkgs.lib) mkRustPlatform ;
    inherit (releng_pkgs.pkgs) rustChannelOf bash autoconf213 clang_4 llvm_4 llvmPackages_4 gcc-unwrapped glibc fetchFromGitHub;
    inherit (releng_pkgs.pkgs.devEnv) gecko;
  
    # Rust 1.28.1-beta6
  