these 3 derivations will be built:
  /nix/store/qg683lha8rwmhcfr0pmq9hh3s99qyni0-source.drv
  /nix/store/2l47ippndav3kpvmgr6x675lm3g0sfad-semble-0.6.2.drv
  /nix/store/fqlbvgknv04izh6grq929v2h774l4rkr-check-semble.drv