! stdout randautoseed

# Go 1.20 work module should set panicnil=1.
cp go.mod.20 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
stdout panicnil=1
stdout randautoseed=0

# Go 1.20 work module should set panicnil=1 in Go 1.20 dependency.
cp go.mod.20 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
stdout panicnil=1
! stdout randautoseed

// function to avoid locking. This is not possible if the user called Seed,
// either explicitly or implicitly via GODEBUG=randautoseed=0.
var globalRandGenerator atomic.Pointer[Rand]

var randautoseed = godebug.New("randautoseed")

// globalRand returns the generator to use for the top-level convenience
// functions.
func globalRand() *Rand {
	if r := globalRandGenerator.Load(); r != nil {

	{Name: "multipartmaxparts", Package: "mime/multipart"},
	{Name: "multipathtcp", Package: "net"},
	{Name: "netdns", Package: "net", Opaque: true},
	{Name: "panicnil", Package: "runtime", Changed: 21, Old: "1"},
	{Name: "randautoseed", Package: "math/rand"},
	{Name: "tarinsecurepath", Package: "archive/tar"},
	{Name: "tls10server", Package: "crypto/tls", Changed: 22, Old: "1"},
	{Name: "tls3des", Package: "crypto/tls", Changed: 23, Old: "1"},

			cmd = testenv.CleanCmdEnv(cmd)
			cmd.Env = append(cmd.Env, fmt.Sprintf("GO_RAND_TEST_HELPER_CODE=%d", i/2))
			if i%2 != 0 {
				cmd.Env = append(cmd.Env, "GODEBUG=randautoseed=0")
			}
			out, err := cmd.CombinedOutput()
			if len(out) > 0 {
				t.Logf("%s", out)
			}
			if err != nil {
				t.Error(err)
			}
		})
	}
}

`tarinsecurepath=0` and `zipinsecurepath=0`.

Go 1.20 introduced automatic seeding of the
[`math/rand`](/pkg/math/rand) global random number generator,
controlled by the [`randautoseed` setting](/pkg/math/rand/#Seed).

Go 1.20 introduced the concept of fallback roots for use during certificate verification,
controlled by the [`x509usefallbackroots` setting](/pkg/crypto/x509/#SetFallbackRoots).

		package due to a non-default GODEBUG=panicnil=... setting.

	/godebug/non-default-behavior/randautoseed:events
		The number of non-default behaviors executed by the math/rand
		package due to a non-default GODEBUG=randautoseed=... setting.

	/godebug/non-default-behavior/tarinsecurepath:events
		The number of non-default behaviors executed by the archive/tar
		package due to a non-default GODEBUG=tarinsecurepath=...
		setting.