// This is used to try hard to get a panic stack trace out when exiting.
var runningPanicDefers atomic.Uint32

// panicking is non-zero when crashing the program for an unrecovered panic.
var panicking atomic.Uint32

// paniclk is held while printing the panic information and stack trace,
// so that two concurrent panics don't overlap their output.
var paniclk mutex

}

// Int64 returns v's value as an int64. It panics
// if v is not a signed integer.
func (v Value) Int64() int64 {
	if g, w := v.Kind(), KindInt64; g != w {
		panic(fmt.Sprintf("Value kind is %s, not %s", g, w))
	}
	return int64(v.num)
}

// Uint64 returns v's value as a uint64. It panics
// if v is not an unsigned integer.
func (v Value) Uint64() uint64 {

// It panics if n <= 0.
func (r *Rand) Int64N(n int64) int64 {
	if n <= 0 {
		panic("invalid argument to Int64N")
	}
	return int64(r.uint64n(uint64(n)))
}

// Uint64N returns, as a uint64, a non-negative pseudo-random number in the half-open interval [0,n).
// It panics if n == 0.
func (r *Rand) Uint64N(n uint64) uint64 {
	if n == 0 {
		panic("invalid argument to Uint64N")
	}

		m.Value = Value{kind: ValueUint64, scalar: e.base.args[0]}
	default:
		panic(fmt.Sprintf("internal error: unexpected event type for Metric kind: %s", go122.EventString(e.base.typ)))
	}
	return m
}

// Label returns details about a Label event.
//
// Panics if Kind != EventLabel.
func (e Event) Label() Label {
	if e.Kind() != EventLabel {
		panic("Label called on non-Label event")
	}
	if e.base.typ != go122.EvGoLabel {

// from the default [Source].
// It panics if n <= 0.
func Int63n(n int64) int64 { return globalRand().Int63n(n) }

// Int31n returns, as an int32, a non-negative pseudo-random number in the half-open interval [0,n)
// from the default [Source].
// It panics if n <= 0.
func Int31n(n int32) int32 { return globalRand().Int31n(n) }

		log.Fatal(err)
	}
	reportHash(name)
}

// check panics if err is not nil. Otherwise it returns x.
// It is only meant to be used in a function that has deferred
// a function to recover appropriately from the panic.
func check[T any](x T, err error) T {
	check1(err)
	return x
}

// check1 panics if err is not nil.
// It is only meant to be used in a function that has deferred

// descriptors, this function panics.
//
// Panics if `labels` is not a list of ordered label name and label value pairs
// or if all labels for the metric are not provided.
func (m *MetricValues) Set(name MetricName, value float64, labels ...string) {
	desc, ok := m.descriptors[name]
	if !ok {
		panic(fmt.Sprintf("metric has no description: %s", name))
	}

	return z
}

func validateBinaryOperands(x, y *Float) {
	if !debugFloat {
		// avoid performance bugs
		panic("validateBinaryOperands called but debugFloat is not set")
	}
	if len(x.mant) == 0 {
		panic("empty mantissa for x")
	}
	if len(y.mant) == 0 {
		panic("empty mantissa for y")
	}
}

// z = x + y, ignoring signs of x and y for the addition

			return
		}
		if !top && !isPinned(p) {
			panic(errorString(msg))
		}

		cgoCheckUnknownPointer(p, msg)
	}
}

// cgoCheckUnknownPointer is called for an arbitrary pointer into Go
// memory. It checks whether that Go memory contains any other
// pointer into unpinned Go memory. If it does, we panic.
// The return values are unused but useful to see in panic tracebacks.

	output := runTestProg(t, "testprog", "RecursivePanic3")
	want := `panic: first panic

`
	if !strings.HasPrefix(output, want) {
		t.Fatalf("output does not start with %q:\n%s", want, output)
	}

}

func TestRecursivePanic4(t *testing.T) {
	output := runTestProg(t, "testprog", "RecursivePanic4")
	want := `panic: first panic [recovered]
	panic: second panic
`
	if !strings.HasPrefix(output, want) {