structuredAttrs is enabled

trying https://static.crates.io/crates/slab/slab-0.4.12.crate
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  19080 100  19080   0      0 544.1k      0                              0