these 4 derivations will be built:
  /nix/store/vsndns0nmn5qfs47l7v9kvi02fl6hm6g-clan-cli-source.drv
  /nix/store/89nnpchr5q397xxj5gn5wsvcr136ia0j-clan-cli.drv
  /nix/store/x3gnzxgk1gi9740i1rq9sqpqqipjx955-closure-info.drv
  /nix/store/p5s7dglsvwfdndb799mhc4dgm6m8hvhl-check-vars.drv
error: path '/nix/store/q9y948klp96cj2za8lmvy84za7wx8ngp-check-vars' is not valid
error: Cannot build '/nix/store/p5s7dglsvwfdndb799mhc4dgm6m8hvhl-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/q9y948klp96cj2za8lmvy84za7wx8ngp-check-vars