these 4 derivations will be built:
  /nix/store/l6q13pmlva696qgh0lld74bl21lvp3cx-clan-cli-source.drv
  /nix/store/fdp24sbznq674r6894drq55dmjnklwhj-clan-cli.drv
  /nix/store/zfzxin7fiyl3cs70aq1khd7y0108i5sf-closure-info.drv
  /nix/store/2fyqvpiji1z11aws5fi3kxfj4aii0zxg-check-vars.drv
error: path '/nix/store/k8gk3b6flg86y04kpbk9mq3pggfma1i0-check-vars' is not valid
error: Cannot build '/nix/store/2fyqvpiji1z11aws5fi3kxfj4aii0zxg-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/k8gk3b6flg86y04kpbk9mq3pggfma1i0-check-vars