these 2 derivations will be built:
  /nix/store/c46jb5zfjb590pzn9i4xijl8fw3rgi8z-closure-info.drv
  /nix/store/d42b2kxikmn6wr710janaw08drkddywh-check-vars.drv
error: path '/nix/store/z2a93bssf1wc9n8yi3ffvhclrd519bn7-check-vars' is not valid
error: Cannot build '/nix/store/d42b2kxikmn6wr710janaw08drkddywh-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/z2a93bssf1wc9n8yi3ffvhclrd519bn7-check-vars