these 5 derivations will be built:
  /nix/store/lm4pi4sas9lvzhq7lcz4hph8121r5i88-dsh-0.2.1-rc.2.tgz.drv
  /nix/store/cmb2xf7d6kh5b1l0gsxj38rs2mfza4q8-dsh-source.drv
  /nix/store/wfgkslg5pfsrg7hdrzwd2m0i1yb4yrbk-dsh-0.2.1-rc.2-npm-deps.drv
  /nix/store/13hrql202zyindr97383iaa5292jz5cc-dsh-0.2.1-rc.2.drv
  /nix/store/7x4g5jj5hi48w3l1vrvnkw9asz1w92w8-check-dsh.drv