src/vs/editor/contrib/parameterHints/parameterHints.ts/ParameterHintsController/constructor
class ParameterHintsController:	constructor(editor: ICodeEditor, @IInstantiationService instantiationService: IInstantiationService) {
		super();
		this.editor = editor;
		this.widget = this._register(instantiationService.createInstance(ParameterHintsWidget, this.editor));
	}