src/vs/workbench/contrib/callHierarchy/common/callHierarchy.ts/CallHierarchyModel/resolveIncomingCalls
class CallHierarchyModel:	async resolveIncomingCalls(item: CallHierarchyItem, token: CancellationToken): Promise<IncomingCall[]> {
		try {
			const result = await this.provider.provideIncomingCalls(item, token);
			if (isNonEmptyArray(result)) {
				return result;
			}
		} catch (e) {
			onUnexpectedExternalError(e);
		}
		return [];
	}