these 4 derivations will be built:
  /nix/store/kl7hqan1xzfaj0a0n8x67ccfn4cxs12r-clan-cli-source.drv
  /nix/store/48z7l1hzjsrw52qhph20qd2cal4az2fz-clan-cli.drv
  /nix/store/yg36rqbb9ywxa2kgmjw60rgyzq12k6mw-closure-info.drv
  /nix/store/qrbykpk0q77q4qnp22ydxq40a990z18v-check-vars.drv
error: path '/nix/store/1k9pn3b1qs2wi7is1v0jikajb3vv4qif-check-vars' is not valid
error: Cannot build '/nix/store/qrbykpk0q77q4qnp22ydxq40a990z18v-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/1k9pn3b1qs2wi7is1v0jikajb3vv4qif-check-vars