these 2 derivations will be built:
  /nix/store/c2rvbk5367nbc1y8052l7yjhvjkr4mcq-closure-info.drv
  /nix/store/2626m2hxc25pfq48zniknkigy15q603f-check-vars.drv
error: path '/nix/store/myl0xfpsnz63lapn8f7ngfz4sl19my52-check-vars' is not valid
error: Cannot build '/nix/store/2626m2hxc25pfq48zniknkigy15q603f-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/myl0xfpsnz63lapn8f7ngfz4sl19my52-check-vars