these 2 derivations will be built:
  /nix/store/fcg8gcmy9sv7v2fs7il82zm1fm5y7wjn-closure-info.drv
  /nix/store/b8zbff7kfixam47w4dhhamm83ym39bg5-check-vars.drv
error: path '/nix/store/7pjxfj38cgz39fg1yn9k2jkzf7w3h0z6-check-vars' is not valid
error: Cannot build '/nix/store/b8zbff7kfixam47w4dhhamm83ym39bg5-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/7pjxfj38cgz39fg1yn9k2jkzf7w3h0z6-check-vars