these 4 derivations will be built:
  /nix/store/cxmjizdpp35ykhk9zgmdfs01nps4aah2-source.drv
  /nix/store/138yjkixchqz2z29sw6aw6biqf1w3zg0-mercat-0.3.7-zig-deps.drv
  /nix/store/k25qnbbabr52p0c71s1n1d6mmlaxfyyy-mercat-0.3.7.drv
  /nix/store/q56ilpm1nirn95g0l825hfqd587lai4i-check-mercat.drv