these 4 derivations will be built:
  /nix/store/bjajr78yq5lpd9752f2yx1dq14gac32l-clan-cli-source.drv
  /nix/store/bymmn30xq7np990ki17j7zhrvnzckw18-clan-cli.drv
  /nix/store/p7d0g4h9qqqwvxlwkyqr60ankrrakd2y-closure-info.drv
  /nix/store/7a8d1gi83saswl3xh145viwh8jgk463y-check-vars.drv
error: path '/nix/store/nwnl92wlj7j4m0fd3hrf304dmln1pz2z-check-vars' is not valid
error: Cannot build '/nix/store/7a8d1gi83saswl3xh145viwh8jgk463y-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/nwnl92wlj7j4m0fd3hrf304dmln1pz2z-check-vars