these 2 derivations will be built:
  /nix/store/n1i75c2y6kkd4x7x93xcaymsl2cww89f-closure-info.drv
  /nix/store/c0xbff80azpbnpsfbrdc8s2dkx0lzixs-check-vars.drv
error: path '/nix/store/06kyp1267rvqkcwf4pdi7d2b75pb7xma-check-vars' is not valid
error: Cannot build '/nix/store/c0xbff80azpbnpsfbrdc8s2dkx0lzixs-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/06kyp1267rvqkcwf4pdi7d2b75pb7xma-check-vars