tribuchet: building on mac02
structuredAttrs is enabled

trying https://static.crates.io/crates/proptest-derive/0.9.0/download
  % 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  64803 100  64803   0      0  0.98M      0                              0
100  64803 100  64803   0      0  0.97M      0                              0
100  64803 100  64803   0      0  0.97M      0                              0