these 5 derivations will be built:
  /nix/store/7arsl20zy8mb4pn2xlmqb5vw886bp626-closure-info.drv
  /nix/store/bq0ni8ba21d8a74fiqc45j6zj53qm5d2-clan-runtime.drv
  /nix/store/m1fc48rsxkxp01mi5f84605k7bxs6ani-clan-cli-source.drv
  /nix/store/ck96q83aw4gd8q4hlgp67sax58gszfl3-clan-cli.drv
  /nix/store/z94h2ri2884a3y182h4rckw9zm6ba703-check-vars.drv