src/vs/workbench/contrib/debug/browser/variablesView.ts/VariablesDataSource/getChildren
class VariablesDataSource:	getChildren(element: IStackFrame | IExpression | IScope): Promise<(IExpression | IScope)[]> {
		if (isStackFrame(element)) {
			return element.getScopes();
		}

		return element.getChildren();
	}