these 2 derivations will be built:
  /nix/store/ka28xdg5ldmd0l6kfdzkqh41cvzpa79x-closure-info.drv
  /nix/store/5wcb0sf7lla5zllvvd5im41qihxp0r5l-check-vars.drv
error: path '/nix/store/qm8gl0gzkiv4g4k2dijv5y0sa6pqvb0c-check-vars' is not valid
error: Cannot build '/nix/store/5wcb0sf7lla5zllvvd5im41qihxp0r5l-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/qm8gl0gzkiv4g4k2dijv5y0sa6pqvb0c-check-vars