this derivation will be built:
  /nix/store/s21wky3bl5yv0kqqhkkvx6xcblw50s7j-iets-langtests.drv
building '/nix/store/s21wky3bl5yv0kqqhkkvx6xcblw50s7j-iets-langtests.drv'
iets-langtests> pass=291 fail=0
iets-langtests> 

upload niks3: ok