anchor.diff:  
         ${optionalString needsPatchelf ''
           patchelf \
  +          --set-rpath "${stdenv.lib.makeLibraryPath [ curl zlib ]}" \
             --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
             "$out/bin/cargo"
         ''}
  
positive.code: { stdenv, fetchurl, makeWrapper, cacert, zlib, buildRustPackage }:
  
  let
    inherit (stdenv.lib) optionalString;
  
negative.code:      sha256 = bootstrapHash;
    };
  
    version = "2017-03-16";
  in
  
  rec {
  