these 2 derivations will be built:
  /nix/store/z2iawx8ycxsw5cbyhcig28kirxm9xgyq-closure-info.drv
  /nix/store/hxhg551whnzwngs7qr2b3sw6qsp10glk-check-vars.drv
error: path '/nix/store/6y5vh48qcn9hdf38pa3z71z0gc7qkj9x-check-vars' is not valid
error: Cannot build '/nix/store/hxhg551whnzwngs7qr2b3sw6qsp10glk-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/6y5vh48qcn9hdf38pa3z71z0gc7qkj9x-check-vars