src/vs/workbench/services/extensions/common/rpcProtocol.ts/RPCProtocol/_receiveCancel
class RPCProtocol:	private _receiveCancel(msgLength: number, req: number): void {
		if (this._logger) {
			this._logger.logIncoming(msgLength, req, RequestInitiator.OtherSide, `receiveCancel`);
		}
		const callId = String(req);
		if (this._cancelInvokedHandlers[callId]) {
			this._cancelInvokedHandlers[callId]();
		}
	}