these 4 derivations will be built:
  /nix/store/6w3qyi1wdfqxjzrn1iy4idif75hki020-clan-cli-source.drv
  /nix/store/2im1mvp54pnawfxx1f6msy99zg67fpzz-clan-cli.drv
  /nix/store/px25h5j3r5frgnfy0qjajscq662szjb7-closure-info.drv
  /nix/store/1lzl37b444329rrbdz6xq4c86ayz3qbv-check-vars.drv
error: path '/nix/store/zc7rflmm6h2j116463rxkjcbz1xl6vyr-check-vars' is not valid
error: Cannot build '/nix/store/1lzl37b444329rrbdz6xq4c86ayz3qbv-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/zc7rflmm6h2j116463rxkjcbz1xl6vyr-check-vars