this derivation will be built:
  /nix/store/l0xynnw3parjl4sw6zqpa7jhaw7kzm31-interpolate-conformance.drv
building '/nix/store/l0xynnw3parjl4sw6zqpa7jhaw7kzm31-interpolate-conformance.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&system=aarch64-linux&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/l0xynnw3parjl4sw6zqpa7jhaw7kzm31-interpolate-conformance.drv' on farm.numtide.com:50051
interpolate-conformance> elastic-arm-ac8bb7f5: building l0xynnw3parjl4sw6zqpa7jhaw7kzm31-interpolate-conformance.drv
interpolate-conformance> 10 cases: Nix interpolate == Python interpolate == expected