these 2 derivations will be built:
  /nix/store/ixmfgz253p0fn4yz767yyy2ps5nmw6z0-closure-info.drv
  /nix/store/2wjk4448cp0czhkrgi7fqjyki0sg9rin-check-vars.drv
error: path '/nix/store/hv6q9yry9lakcwgyfa1l566n334lkc6z-check-vars' is not valid
error: Cannot build '/nix/store/2wjk4448cp0czhkrgi7fqjyki0sg9rin-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/hv6q9yry9lakcwgyfa1l566n334lkc6z-check-vars