extensions/markdown-language-features/src/features/documentSymbolProvider.ts/MDDocumentSymbolProvider/provideDocumentSymbolInformation
class MDDocumentSymbolProvider:	public async provideDocumentSymbolInformation(document: SkinnyTextDocument): Promise<vscode.SymbolInformation[]> {
		const toc = await new TableOfContentsProvider(this.engine, document).getToc();
		return toc.map(entry => this.toSymbolInformation(entry));
	}