structuredAttrs is enabled

trying https://github.com/pypa/installer/archive/1.0.1.tar.gz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100 474.0k   0 474.0k   0      0 820.7k      0                              0
unpacking source archive /build/download.tar.gz