these 2 derivations will be built:
  /nix/store/zwapszjj6vl23kmdm1r2ncl4379sxn7w-closure-info.drv
  /nix/store/mg9qkrrvlr2q2kqwgngprsbrywsyfjzd-check-vars.drv
error: path '/nix/store/bzr347ah5yn025d7300vagqk4jsy52rh-check-vars' is not valid
error: Cannot build '/nix/store/mg9qkrrvlr2q2kqwgngprsbrywsyfjzd-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/bzr347ah5yn025d7300vagqk4jsy52rh-check-vars