this derivation will be built:
  /nix/store/maccr3kw6n0221hsfcxcgipi0r6b74b4-iets-langtests.drv
building '/nix/store/maccr3kw6n0221hsfcxcgipi0r6b74b4-iets-langtests.drv'
iets-langtests> pass=290 fail=0
iets-langtests> 

upload niks3: ok