these 2 derivations will be built:
  /nix/store/zisf5qbfl3lfbah3irnyizbm7ny02wbl-closure-info.drv
  /nix/store/4n6vfk0pikvif21q4n9gcwm73m4f21cg-check-vars.drv
error: path '/nix/store/a6n2xnasig5pssm1bvxyggngx504fc5q-check-vars' is not valid
error: Cannot build '/nix/store/4n6vfk0pikvif21q4n9gcwm73m4f21cg-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/a6n2xnasig5pssm1bvxyggngx504fc5q-check-vars