this derivation will be built:
  /nix/store/hb2ysx2q99zjbsg8xkbc97scxc4sr1h7-iets-partest.drv
building '/nix/store/hb2ysx2q99zjbsg8xkbc97scxc4sr1h7-iets-partest.drv'
iets-partest> note: no nix-instantiate on PATH; comparing worker counts only
iets-partest> ok   shared-graph (rc=0)
iets-partest> ok   deep-attrs (rc=0)
iets-partest> ok   cycle (rc=1)
iets-partest> ok   cycle-two-ranges (rc=1)
iets-partest> ok   cycle-deep (rc=1)
iets-partest> ok   error-elem (rc=1)
iets-partest> ok   try-eval (rc=0)
iets-partest> ok   trace-once (rc=0)