FormatPAX

	// FormatGNU represents the GNU header format.
	//
	// The GNU header format is older than the USTAR and PAX standards and
	// is not compatible with them. The GNU format supports
	// arbitrary file sizes, filenames of arbitrary encoding and length,
	// sparse files, and other features.
	//
	// It is recommended that PAX be chosen over GNU unless the target
	// application can only parse GNU formatted archives.
	//
	// Reference:

it defaults to `panicnil=0`, making `panic(nil)` a run-time error.
Using `panicnil=1` restores the behavior of Go 1.20 and earlier.

When compiling a work module or workspace that declares
an older Go version, the Go toolchain amends its defaults
to match that older Go version as closely as possible.
For example, when a Go 1.21 toolchain compiles a program,
if the work module's `go.mod` or the workspace's `go.work`

// Package tar implements access to tar archives.
//
// Tape archives (tar) are a file format for storing a sequence of files that
// can be read and written in a streaming manner.
// This package aims to cover most variations of the format,
// including those produced by GNU and BSD tar tools.
package tar

import (
	"errors"
	"fmt"
	"internal/godebug"
	"io/fs"
	"math"
	"path"
	"reflect"
	"strconv"

// the old assembler's (5a's) grammar and hand-writing complete
// instructions for each rule, to guarantee we cover the same space.

#include "../../../../../runtime/textflag.h"

TEXT	foo(SB), DUPOK|NOSPLIT, $0

// ADD
//
//	LTYPE1 cond imsr ',' spreg ',' reg
//	{
//		outcode($1, $2, &$3, $5, &$7);
//	}
// Cover some operand space here too.
	ADD	$1, R2, R3
	ADD	R1<<R2, R3, R4
	ADD	R1>>R2, R3, R4
	ADD	R1@>R2, R3, R4

// license that can be found in the LICENSE file.

// This input was created by taking the instruction productions in
// the old assembler's (7a's) grammar and hand-writing complete
// instructions for each rule, to guarantee we cover the same space.

#include "../../../../../runtime/textflag.h"

TEXT	foo(SB), DUPOK|NOSPLIT, $-8

// arithmetic operations
	ADDW	$1, R2, R3
	ADDW	R1, R2, R3
	ADDW	R1, ZR, R3
	ADD	$1, R2, R3
	ADD	R1, R2, R3

These observations lead to a set of two equations
</p>

<pre>
	Slice ≡<sub>A</sub> S      (1)
	S     ≡<sub>C</sub> ~[]E   (2)
</pre>

<p>
which now can be solved for the type parameters <code>S</code> and <code>E</code>.
From (1) a compiler can infer that the type argument for <code>S</code> is <code>Slice</code>.

pkg testing, func MainStart(testDeps, []InternalTest, []InternalBenchmark, []InternalExample) *M
pkg testing, func RegisterCover(Cover)
pkg text/scanner, const GoTokens = 1012
pkg text/template/parse, type DotNode bool
pkg text/template/parse, type Node interface { Copy, String, Type }
pkg unicode, const Version = "10.0.0"