src/vs/workbench/api/common/extHostLanguageFeatures.ts/ExtHostLanguageFeatures/$provideTypeHierarchySupertypes
class ExtHostLanguageFeatures:	$provideTypeHierarchySupertypes(handle: number, sessionId: string, itemId: string, token: CancellationToken): Promise<extHostProtocol.ITypeHierarchyItemDto[] | undefined> {
		return this._withAdapter(handle, TypeHierarchyAdapter, adapter => adapter.provideSupertypes(sessionId, itemId, token), undefined, token);
	}