src/vs/editor/contrib/hover/modesContentHover.ts/ModesContentComputer/_computeAsync
class ModesContentComputer:	private async _computeAsync(participant: IEditorHoverParticipant, lineDecorations: IModelDecoration[], anchor: HoverAnchor, token: CancellationToken): Promise<IHoverPart[]> {
		if (!participant.computeAsync) {
			return [];
		}
		return participant.computeAsync(anchor, lineDecorations, token);
	}