src/vs/editor/contrib/quickAccess/browser/gotoSymbolQuickAccess.ts/AbstractGotoSymbolQuickAccessProvider/getDocumentSymbols
class AbstractGotoSymbolQuickAccessProvider:	protected async getDocumentSymbols(document: ITextModel, token: CancellationToken): Promise<DocumentSymbol[]> {
		const model = await this._outlineModelService.getOrCreate(document, token);
		return token.isCancellationRequested ? [] : model.asListOfDocumentSymbols();
	}