src/vs/workbench/api/common/extHostLanguageFeatures.ts/ExtHostLanguageFeatures/$releaseCallHierarchy
class ExtHostLanguageFeatures:	$releaseCallHierarchy(handle: number, sessionId: string): void {
		this._withAdapter(handle, CallHierarchyAdapter, adapter => Promise.resolve(adapter.releaseSession(sessionId)), undefined, undefined);
	}