==================================
Metric Definition, With Parameters
==================================

module corpus_test_metrics is
  metric numberOfThings(err -> Errors) -> count
end

---

(module
  (identifier)
  (module_body
    (metric_def
      (function_def
        (function_signature
          (identifier)
          (function_parameter
            (identifier)
            (function_type_reference
              (identifier_reference
                (identifier))))
          (function_type_reference
            (identifier_reference
              (identifier))))))))
