*/
  fun cancel()

  /**
   * Carries an exchange. This is usually a connection, but it could also be a connect plan for
   * CONNECT tunnels. Note that CONNECT tunnels are significantly less capable than connections.
   */
  interface Carrier {
    val route: Route

    fun trackFailure(
      call: RealCall,
      e: IOException?,
    )

    fun noNewExchanges()

   *
   * <p>Ideally, this number should be close to the {@code fpp} parameter passed in {@linkplain
   * #create(Funnel, int, double)}, or smaller. If it is significantly higher, it is usually the
   * case that too many elements (more than expected) have been put in the {@code BloomFilter},
   * degenerating it.
   *
   * @since 14.0 (since 11.0 as expectedFalsePositiveProbability())

## Compiler {#compiler}

The build time overhead to building with [Profile Guided Optimization](/doc/pgo) has been reduced significantly.
Previously, large builds could see 100%+ build time increase from enabling PGO.
In Go 1.23, overhead should be in the single digit percentages.

<!-- https://go.dev/issue/62737 , https://golang.org/cl/576681,  https://golang.org/cl/577615 -->
The compiler in Go 1.23 can now overlap the stack frame slots of local variables

// transparently retrying errors up to an arbitrary timeout.
//
// Errors are classified heuristically and retries are bounded, so the functions
// in this package do not completely eliminate spurious errors. However, they do
// significantly reduce the rate of failure in practice.
//
// If so, the error will likely wrap one of:
// The functions in this package do not completely eliminate spurious errors,

	var out []int64
	for i := 0; i < 10; i++ {
		out = append(out, Int63())
	}

	// Look for out in Seed(1)'s output.
	// Strictly speaking, we should look for them in order,
	// but this is good enough and not significantly more
	// likely to have a false positive.
	Seed(1)
	found := 0
	for i := 0; i < 1000; i++ {
		x := Int63()
		if x == out[found] {
			found++
			if found == len(out) {

This directory holds Go modules served by a Go module proxy
that runs on localhost during tests, both to make tests avoid
requiring specific network servers and also to make them 
significantly faster.

A small go get'able test module can be added here by running

	cd cmd/go/testdata
	go run addmod.go path@vers

where path and vers are the module path and version to add here.

For interactive experimentation using this set of modules, run:

	// arrived during the exitsyscall following a cgocall(back) in dropg or
	// execute, when updating mp.curg.
	//
	// These are reachable only when exitsyscall finds no P available. Thus
	// we make C calls from significantly more Gs than there are available
	// Ps. Lots of runnable work combined with >20us spent in callGo makes
	// it possible for sysmon to retake Ps, forcing C calls to go down the
	// desired exitsyscall path.
	//

	var out []int64
	for i := 0; i < 10; i++ {
		out = append(out, Int64())
	}

	// Look for out in seeded output.
	// Strictly speaking, we should look for them in order,
	// but this is good enough and not significantly more
	// likely to have a false positive.
	r := New(NewPCG(1, 0))
	found := 0
	for i := 0; i < 1000; i++ {
		x := r.Int64()
		if x == out[found] {
			found++
			if found == len(out) {

// does modify the key between operations, we save the original values
// alongside the cached BoringCrypto key and check that the real key
// still matches before using the cached key. The theory is that the real
// operations are significantly more expensive than the comparison.

var pubCache bcache.Cache[PublicKey, boringPub]
var privCache bcache.Cache[PrivateKey, boringPriv]

func init() {
	pubCache.Register()
	privCache.Register()
}

Improving the network link between the build and the remote cache can significantly improve build cache performance.
How to do this depends on the remote cache in use and your network environment.

The multi-node remote build cache provided by Develocity is a fast and efficient, purpose built, remote build cache.