ExtensionGenerator.topLevel constructor
      
      ExtensionGenerator.topLevel(
    
    
- FieldDescriptorProto descriptor,
- ProtobufContainer parent,
- Set<String> usedNames,
- int repeatedFieldIndex,
Implementation
ExtensionGenerator.topLevel(FieldDescriptorProto descriptor,
    ProtobufContainer parent, Set<String> usedNames, int repeatedFieldIndex)
    : this._(descriptor, parent, usedNames, repeatedFieldIndex,
          _topLevelFieldTag);