these 2 derivations will be built:
  /nix/store/jf307vkm74p6ni74a5bicrihcdrcfapa-closure-info.drv
  /nix/store/cm03pbglq299bigi37d9vpz6a42idd8z-check-vars.drv
error: path '/nix/store/56fjvy9wmdy9gqnd0iwlkx3jgbaxp9p7-check-vars' is not valid
error: Cannot build '/nix/store/cm03pbglq299bigi37d9vpz6a42idd8z-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/56fjvy9wmdy9gqnd0iwlkx3jgbaxp9p7-check-vars