of the location.
</p>


<h3 id="Handling_panics">Handling panics</h3>

<p> Two built-in functions, <code>panic</code> and <code>recover</code>,
assist in reporting and handling <a href="#Run_time_panics">run-time panics</a>
and program-defined error conditions.
</p>

<pre class="grammar">
func panic(interface{})
func recover() interface{}
</pre>

<p>

	fl := funcLine{f: fn, base: pos.Base(), line: pos.Line()}
	bPanic := s.panics[fl]
	if bPanic == nil {
		bPanic = s.f.NewBlock(ssa.BlockPlain)
		s.panics[fl] = bPanic
		s.startBlock(bPanic)
		// The panic call takes/returns memory to ensure that the right
		// memory state is observed if the panic happens.
		s.rtcall(fn, false, nil)
	}
	b.AddEdgeTo(bNext)
	b.AddEdgeTo(bPanic)

	// so we'll consistently panic instead and help people find their bugs
	// early. (We can't return an error from WriteHeader even if we wanted to.)
	if code < 100 || code > 999 {
		panic(fmt.Sprintf("invalid WriteHeader code %v", code))
	}
}

func (w *http2responseWriter) WriteHeader(code int) {
	rws := w.rws
	if rws == nil {
		panic("WriteHeader called after Handler finished")
	}

- Fixed node lifecycle controller panic when conditionType ready is been patch `nil` by mistake. ([#122874](https://github.com/kubernetes/kubernetes/pull/122874), [@fusida](https://github.com/fusida))
- Fixed panic of Evented `PLEG` during kubelet start-up. ([#122475](https://github.com/kubernetes/kubernetes/pull/122475), [@pacoxu](https://github.com/pacoxu))

- K8s.io/component-base/logs: usage of the pflag values in a normal Go flag set led to panics when printing the help message ([#114680](https://github.com/kubernetes/kubernetes/pull/114680), [@pohly](https://github.com/pohly)) [SIG Instrumentation]

- Fixes a 1.29.0 regression that introduced a possible data race that could cause panics in kube-controller-manager and kube-scheduler ([#124518](https://github.com/kubernetes/kubernetes/pull/124518), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery and Scheduling]

- Kubeadm: fix panic in the command "kubeadm certs check-expiration" when "/etc/kubernetes/pki" exists but cannot be read. ([#124124](https://github.com/kubernetes/kubernetes/pull/124124), [@carlory](https://github.com/carlory)) [SIG Cluster Lifecycle]

					oldReq.Key = newReq.Key // +k8s:verify-mutation:reason=clone
				}
				return apiequality.Semantic.DeepEqual(newReq, oldReq)
			},
		)
		if err != nil {
			panic(fmt.Errorf("failed to instantiate semantic equalities: %w", err))
		}
		maskNodeSelectorLabelChangeEqualities = eqs
	})
	return maskNodeSelectorLabelChangeEqualities
}