these 2 derivations will be built:
  /nix/store/yfik6li927gb0y369mpl4q209svrgjrk-happy-coder-1.2.5.drv
  /nix/store/29gw2nnznm7j3356kgrwlsfy56p9j989-check-happy-coder.drv
this path will be fetched (9.5 MiB download, 113.2 MiB unpacked):
  /nix/store/yzlvazrkxdywnp1j9h8xkdw8ax5k2aaz-difftastic-0.71.0