message: Add new error code for async resources
diff: @@ -171,6 +171,8 @@ enum class sec : uint8_t {
  /// Signals to a component that is has been discarded by its parent or the
  /// consumer/producer that was attached to the component.
  discarded = 70,
  + /// Failed to open a resource.
  + cannot_open_resource,
  };
  // --(rst-sec-end)--
  