these 4 derivations will be built:
  /nix/store/b1sqss0b7l649xf56mfmi58w5bcxcc3c-clan-cli-source.drv
  /nix/store/v9hlw5zh9lablrniggwgkh3i4s4rqrrf-closure-info.drv
  /nix/store/vycz481885f564q2sb4k9xgkkq05c15s-clan-cli.drv
  /nix/store/mcwzz0scqqqv3698hghfmaw5ghpq17wg-check-vars.drv
error: path '/nix/store/xrrgcv8gs6pwxpxvskkp04ckphcvvsqi-check-vars' is not valid
error: Cannot build '/nix/store/mcwzz0scqqqv3698hghfmaw5ghpq17wg-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/xrrgcv8gs6pwxpxvskkp04ckphcvvsqi-check-vars