anchor.diff:  const _x64Files = {
     'mac': 'sdk/dartsdk-macos-x64-release.zip',
     'linux': 'sdk/dartsdk-linux-x64-release.zip',
  +  'linux-arm': 'sdk/dartsdk-linux-arm64-release.zip',
   };
   const _ia32Files = {
     'mac': 'sdk/dartsdk-macos-ia32-release.zip',
     'linux': 'sdk/dartsdk-linux-ia32-release.zip',
  +  'linux-arm': 'sdk/dartsdk-linux-arm-release.zip',
   };
   
   Future<String> _getHash256(
  
positive.code:         url "$_urlBase/dev/release/${revisions['dev']}/${_ia32Files['mac']}"
          sha256 "${hashes['dev'][_ia32Files['mac']]}"
        end
      elsif OS.linux?
        if Hardware::CPU.is_64_bit?
          url "$_urlBase/dev/release/${revisions['dev']}/${_x64Files['linux']}"
          sha256 "${hashes['dev'][_x64Files['linux']]}"
        else
          url "$_urlBase/dev/release/${revisions['dev']}/${_ia32Files['linux']}"
          sha256 "${hashes['dev'][_ia32Files['linux']]}"
        end
      end
    end
  
negative.code:       url "$_urlBase/stable/release/${revisions['stable']}/${_ia32Files['mac']}"
        sha256 "${hashes['stable'][_ia32Files['mac']]}"
      end
    elsif OS.linux? && Hardware::CPU.intel?
      if Hardware::CPU.is_64_bit?
        url "$_urlBase/stable/release/${revisions['stable']}/${_x64Files['linux']}"
        sha256 "${hashes['stable'][_x64Files['linux']]}"
      else
        url "$_urlBase/stable/release/${revisions['stable']}/${_ia32Files['linux']}"
        sha256 "${hashes['stable'][_ia32Files['linux']]}"
      end
    elsif OS.linux? && Hardware::CPU.arm?
      if Hardware::CPU.is_64_bit?
        url "$_urlBase/stable/release/${revisions['stable']}/${_x64Files['linux-arm']}"
        sha256 "${hashes['stable'][_x64Files['linux-arm']]}"
      else
        url "$_urlBase/stable/release/${revisions['stable']}/${_ia32Files['linux-arm']}"
        sha256 "${hashes['stable'][_ia32Files['linux-arm']]}"
      end
    end
  
  