these 4 derivations will be built:
  /nix/store/0r6kghixsmingq5393p3w2781q9sc2ng-closure-info.drv
  /nix/store/q7y4f4c64hly879fbjpnbxv80851qkqh-clan-cli-source.drv
  /nix/store/nnirqg6nnhh2kj42waq6q250xaz19spf-clan-cli.drv
  /nix/store/0gifkvrfgpw5whp2d9b1s5iqm44wxq1s-check-vars.drv
error: path '/nix/store/78vpfm3bs9654i9b9ndzla1anzqklk98-check-vars' is not valid
error: Cannot build '/nix/store/0gifkvrfgpw5whp2d9b1s5iqm44wxq1s-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/78vpfm3bs9654i9b9ndzla1anzqklk98-check-vars