these 5 derivations will be built:
  /nix/store/0ybqhxk2faqynxqvni83vbyx3cnnbivh-Cargo.toml.drv
  /nix/store/mkycyg6q18z4qzjpi3rj8gx4p52avx90-Cargo.toml.drv
  /nix/store/4h10msq7cjb411vwayadgsh6xy2id9sp-source.drv
  /nix/store/gxkmydh6v8464pi597kdzpzsjld0d70r-harmonia-deps-3.2.0.drv
  /nix/store/0rci7w7pzbdb0a16fm9cdsr2h6qabz3q-harmonia-llvm-cov-3.2.0.drv