// The AES-GCM construction in TLS has an explicit nonce so that the
			// nonce can be random. However, the nonce is only 8 bytes which is
			// too small for a secure, random nonce. Therefore we use the
			// sequence number as the nonce. The 3DES-CBC construction also has
			// an 8 bytes nonce but its nonces must be unpredictable (see RFC
			// 5246, Appendix F.3), forcing us to use randomness. That's not

// After one has been passed to a TLS function it must not be
// modified. A Config may be reused; the tls package will also not
// modify it.
type Config struct {
	// Rand provides the source of entropy for nonces and RSA blinding.
	// If Rand is nil, TLS uses the cryptographic random reader in package
	// crypto/rand.
	// The Reader must be safe for use by multiple goroutines.
	Rand io.Reader

	}
	if len(nonce) == NonceSizeX {
		// XChaCha20 uses the ChaCha20 core to mix 16 bytes of the nonce into a
		// derived key, allowing it to operate on a nonce of 24 bytes. See
		// draft-irtf-cfrg-xchacha-01, Section 2.3.
		key, _ = HChaCha20(key, nonce[0:16])
		cNonce := make([]byte, NonceSize)
		copy(cNonce[4:12], nonce[16:24])
		nonce = cNonce
	} else if len(nonce) != NonceSize {

Daryl White <******@****.***> 1664425725 -0500

John Howard <******@****.***> 1587615255 -0700

John Howard <******@****.***> 1587615255 -0700

For Java, Groovy, Kotlin, and Android compatibility, see the [full compatibility notes](userguide/compatibility.html).   

## New features and usability improvements

<!-- Do not add breaking changes or deprecations here! Add them to the upgrade guide instead. -->

<!--

Lin Sun <******@****.***> 1713406182 -0400

Frank Budinsky <******@****.***> 1626108261 -0400

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package syntax

// ----------------------------------------------------------------------------
// Nodes

type Node interface {
	// Pos() returns the position associated with the node as follows:
	// 1) The position of a node representing a terminal syntax production