these 5 derivations will be built:
  /nix/store/7n8yipyf0zs8i3rzli9fjmpm6360xv8r-dsh-0.2.2-rc.2.tgz.drv
  /nix/store/ppjf2pf5c3l7sm3ss9yiw9zw04xnl2yy-dsh-source.drv
  /nix/store/mqlwn7isdj1yvsa4c1cyms8crqrp4f16-dsh-0.2.2-rc.2-npm-deps.drv
  /nix/store/fms4ksdbpp070hkw8jbfbq7p3p87avhy-dsh-0.2.2-rc.2.drv
  /nix/store/p3gyi19ibbjf6qd77wvyrbx1jpndygif-check-dsh.drv