toString method
- @override
inherited
    Returns a string representation of this object.
Implementation
@override
String toString({ DiagnosticLevel minLevel = DiagnosticLevel.debug }) {
  String fullString;
  assert(() {
    fullString = toDiagnosticsNode(style: DiagnosticsTreeStyle.singleLine).toString(minLevel: minLevel);
    return true;
  }());
  return fullString ?? toStringShort();
}