these 2 derivations will be built:
  /nix/store/k4d7vz6x0c59myy4g160fsa0jqmigwx2-closure-info.drv
  /nix/store/xkx09nhgvcq8kyfasl2yy6q5ak0hg21x-check-vars.drv
error: path '/nix/store/6bdx01is77k6mfcy85d6j6i43l387gj0-check-vars' is not valid
error: Cannot build '/nix/store/xkx09nhgvcq8kyfasl2yy6q5ak0hg21x-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/6bdx01is77k6mfcy85d6j6i43l387gj0-check-vars