these 2 derivations will be built:
  /nix/store/p7w75bv84qkzad7kr97rdg44nx6krsrw-treefmt.toml.drv
  /nix/store/20fv1z6f2rbc7anmvn7i4dc60id7198b-treefmt.drv
building '/nix/store/p7w75bv84qkzad7kr97rdg44nx6krsrw-treefmt.toml.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=23&system=aarch64-linux&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/p7w75bv84qkzad7kr97rdg44nx6krsrw-treefmt.toml.drv' on farm.numtide.com:50051
treefmt.toml> elastic-arm-bdb1245a: building p7w75bv84qkzad7kr97rdg44nx6krsrw-treefmt.toml.drv
treefmt.toml> structuredAttrs is enabled
building '/nix/store/20fv1z6f2rbc7anmvn7i4dc60id7198b-treefmt.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=23&system=aarch64-linux&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/20fv1z6f2rbc7anmvn7i4dc60id7198b-treefmt.drv' on farm.numtide.com:50051
treefmt> elastic-arm-bdb1245a: building 20fv1z6f2rbc7anmvn7i4dc60id7198b-treefmt.drv
treefmt> structuredAttrs is enabled