these 4 derivations will be built:
  /nix/store/cibva2zhc2lmz3c5643x9ngrc6ggq73f-closure-info.drv
  /nix/store/wd9si5lylfpihkiavx8pcfgrnvs0zcnc-clan-cli-source.drv
  /nix/store/kaqcr6c7zjv0r02gs2c8kns6i0j7mlv3-clan-cli.drv
  /nix/store/z4135qcvj4a257la72dasfajhfp92z87-check-vars.drv
error: path '/nix/store/aqmlwnwfl82bbv5pwkjv49cswxa2jip6-check-vars' is not valid
error: Cannot build '/nix/store/z4135qcvj4a257la72dasfajhfp92z87-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/aqmlwnwfl82bbv5pwkjv49cswxa2jip6-check-vars