these 2 derivations will be built:
  /nix/store/pvdv0d743pbff56mgxzsvzjqn116mz4x-closure-info.drv
  /nix/store/hk0vnw76ak1s1xch366yb125y0idpb2c-check-vars.drv
error: path '/nix/store/ys3a6c09pgsb7y8lsibx9lf2y5z9zfya-check-vars' is not valid
error: Cannot build '/nix/store/hk0vnw76ak1s1xch366yb125y0idpb2c-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/ys3a6c09pgsb7y8lsibx9lf2y5z9zfya-check-vars