these 3 derivations will be built:
  /nix/store/fncbh9l1dyi72rg7ymwp5hhwpkczdx3d-source.drv
  /nix/store/m8z5yysbz61a0pnanw3qlxc0lpgxl8mc-collie-1.27.4.drv
  /nix/store/fy0yvp553f5rrxwcydpya5na2srjh286-check-collie.drv