these 2 derivations will be built:
  /nix/store/qkysb5a5gk311fdjbi418007pb5c9n0a-closure-info.drv
  /nix/store/r19xahrf36chcjzkjx1x7bmv6xq4xq3b-check-vars.drv
error: path '/nix/store/y7f8i6g5ahvs73q3mwpzh3ir45j585p2-check-vars' is not valid
error: Cannot build '/nix/store/r19xahrf36chcjzkjx1x7bmv6xq4xq3b-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/y7f8i6g5ahvs73q3mwpzh3ir45j585p2-check-vars