Engine traceback:
  in select
  in pants.core.goals.check.check
  in pants.backend.scala.goals.check.scalac_check (scalac)
  in pants.engine.internals.graph.coarsened_targets
  in pants.engine.internals.graph.transitive_dependency_mapping
  in pants.engine.internals.graph.resolve_unexpanded_targets (/some/file/path.scala)
  in pants.engine.internals.graph.resolve_dependencies (/some/file/path.scala)
  in pants.backend.scala.dependency_inference.rules.infer_scala_dependencies_via_source_analysis (/some/file/path.scala)
  in pants.jvm.dependency_inference.symbol_mapper.merge_first_party_module_mappings
  in pants.backend.scala.dependency_inference.symbol_mapper.map_first_party_scala_targets_to_symbols
  in pants.backend.scala.dependency_inference.scala_parser.resolve_fallible_result_to_analysis
  in pants.backend.scala.dependency_inference.scala_parser.analyze_scala_source_dependencies
  in process
Traceback (no traceback):
  <pants native internals>
Exception: Error communicating with server: invalid digit found in string