these 2 derivations will be built:
  /nix/store/fj51raszqsf1hxrqpagsfi9f11cbkkjp-closure-info.drv
  /nix/store/vpcn6fpqam8hnd44xlgsdkv7g03spva1-check-vars.drv
error: path '/nix/store/72fymi5iypqs9p3mh53pql9v34j3gsp6-check-vars' is not valid
error: Cannot build '/nix/store/vpcn6fpqam8hnd44xlgsdkv7g03spva1-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/72fymi5iypqs9p3mh53pql9v34j3gsp6-check-vars