extensions/markdown-language-features/src/languageFeatures/documentSymbols.ts/MdDocumentSymbolProvider/provideDocumentSymbolInformation
class MdDocumentSymbolProvider:	public async provideDocumentSymbolInformation(document: ITextDocument): Promise<vscode.SymbolInformation[]> {
		this.logger.verbose('DocumentSymbolProvider', `provideDocumentSymbolInformation - ${document.uri}`);
		const toc = await this.tocProvider.getForDocument(document);
		return toc.entries.map(entry => this.toSymbolInformation(entry));
	}