this derivation will be built:
  /nix/store/jayalnzwqy3lg81552ww8mhfw7p3gvf7-iets-langtests.drv
building '/nix/store/jayalnzwqy3lg81552ww8mhfw7p3gvf7-iets-langtests.drv'
iets-langtests> pass=291 fail=0
iets-langtests> 

upload niks3: ok