these 4 derivations will be built:
  /nix/store/3r5biq8qc71lblnq84k5g60hbgyhssd3-Cargo.toml.drv
  /nix/store/3jgda78pwx70py0214h5wsa570nggpsi-source.drv
  /nix/store/pnypsq6pd87cppx593968avdbls4ihp9-iets-deps-0.2.0.drv
  /nix/store/hpnzl9dnd7dnj4z6q58wl1k33ddrg4ph-iets-doc-0.2.0.drv
building '/nix/store/3r5biq8qc71lblnq84k5g60hbgyhssd3-Cargo.toml.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=20&system=aarch64-linux'
building '/nix/store/3r5biq8qc71lblnq84k5g60hbgyhssd3-Cargo.toml.drv' on farm.numtide.com:50051
Cargo.toml> elastic-arm-d04fab1c: building 3r5biq8qc71lblnq84k5g60hbgyhssd3-Cargo.toml.drv
building '/nix/store/3jgda78pwx70py0214h5wsa570nggpsi-source.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=20&system=aarch64-linux'
building '/nix/store/3jgda78pwx70py0214h5wsa570nggpsi-source.drv' on farm.numtide.com:50051
source> elastic-arm-d04fab1c: building 3jgda78pwx70py0214h5wsa570nggpsi-source.drv
could not copy /nix/store/2p1cmyh0mhq2n59gnh7y0if3r72kxish-source: error: gRPC FetchNars failed: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.2:50051: tcp handshaker shutdown
error: some outputs are unexpectedly invalid