these 2 derivations will be built:
  /nix/store/6340z0syss77b2dza99y8cyyina3z77p-closure-info.drv
  /nix/store/r2j7vm5wk0bqf34w4m9f8bwgdvlpdbg6-check-vars.drv
error: path '/nix/store/bvbibfij20vxzlk82rgdl5da9k5y9p5g-check-vars' is not valid
error: Cannot build '/nix/store/r2j7vm5wk0bqf34w4m9f8bwgdvlpdbg6-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/bvbibfij20vxzlk82rgdl5da9k5y9p5g-check-vars