this derivation will be built:
  /nix/store/jif87s8g7aq60jyl8ll0phyvki9lhc5f-interpolate-conformance.drv
building '/nix/store/jif87s8g7aq60jyl8ll0phyvki9lhc5f-interpolate-conformance.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/jif87s8g7aq60jyl8ll0phyvki9lhc5f-interpolate-conformance.drv' on farm.numtide.com:50051
interpolate-conformance> mac02: building jif87s8g7aq60jyl8ll0phyvki9lhc5f-interpolate-conformance.drv
interpolate-conformance> 10 cases: Nix interpolate == Python interpolate == expected