these 2 derivations will be built:
  /nix/store/pp69pl534f6928dvypp51dh5jbsq02ad-closure-info.drv
  /nix/store/iwm674w41q2p13hsmlqw8fq655r7bm1z-check-vars.drv
error: path '/nix/store/63qpfalvw6bdm7mi6b7m370fx1kd8j82-check-vars' is not valid
error: Cannot build '/nix/store/iwm674w41q2p13hsmlqw8fq655r7bm1z-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/63qpfalvw6bdm7mi6b7m370fx1kd8j82-check-vars