headers: []*Header{{
			Typeflag: TypeReg,
			Name:     "file",
			Uname:    strings.Repeat("long", 10),
			ModTime:  time.Unix(0, 0),
			PAXRecords: map[string]string{
				"GOLANG.pkg": "tar",
				"comment":    "Hello, 世界",
				"uname":      strings.Repeat("long", 10),
			},
			Format: FormatPAX,
		}},
	}, {
		file: "testdata/pax-global-records.tar",
		headers: []*Header{{
			Typeflag:   TypeXGlobalHeader,

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#define X 1

					remove := thisRecLen - int(remain)
					commentLen -= remove
					thisRecLen -= remove
				}
				remain -= int64(thisRecLen)
				f, err := w.CreateHeader(&FileHeader{
					Name:    uint16string,
					Comment: uint16string[:commentLen],
				})
				if err != nil {
					t.Fatalf("CreateHeader: %v", err)
				}
				f.(*fileWriter).crc32 = fakeHash32{}
			}
			if err := w.Close(); err != nil {

pkg go/ast, const RECV = 2
pkg go/ast, const SEND = 1
pkg go/ast, const Typ = 3
pkg go/ast, const Var = 4
pkg go/ast, func NewCommentMap(*token.FileSet, Node, []*CommentGroup) CommentMap
pkg go/ast, method (CommentMap) Comments() []*CommentGroup
pkg go/ast, method (CommentMap) Filter(Node) CommentMap
pkg go/ast, method (CommentMap) String() string
pkg go/ast, method (CommentMap) Update(Node, Node) Node

it compiles into a shared object (.so) that is dynamically linked into
any 6.out that imports the first two files.

The stanza

	// #include <gmp.h>
	import "C"

is a signal to cgo.  The doc comment on the import of "C" provides
additional context for the C file.  Here it is just a single #include
but it could contain arbitrary C definitions to be imported and used.

				Name:     "file",
				Uname:    strings.Repeat("long", 10),
				PAXRecords: map[string]string{
					"path":           "FILE", // Should be ignored
					"GNU.sparse.map": "0,0",  // Should be ignored
					"comment":        "Hello, 世界",
					"GOLANG.pkg":     "tar",
				},
			}, nil},
			testClose{nil},
		},
	}, {
		// Craft a theoretically valid PAX archive with global headers.

# CL 122960043 encoding/xml: add InputOffset method to Decoder, Russ Cox <******@****.***>
pkg encoding/xml, method (*Decoder) InputOffset() int64

# CL 124940043 cmd/go, go/build: implement import comment checking, Russ Cox <******@****.***>
pkg go/build, const ImportComment = 4
pkg go/build, const ImportComment ImportMode
pkg go/build, type Package struct, ImportComment string

pkg go/doc/comment, type DocLink struct, Recv string #51082
pkg go/doc/comment, type DocLink struct, Text []Text #51082
pkg go/doc/comment, type Heading struct #51082
pkg go/doc/comment, type Heading struct, Text []Text #51082
pkg go/doc/comment, type Italic string #51082
pkg go/doc/comment, type Link struct #51082
pkg go/doc/comment, type Link struct, Auto bool #51082
pkg go/doc/comment, type Link struct, Text []Text #51082

		return "float constant"
	case scanner.Char:
		return "rune constant"
	case scanner.String:
		return "string constant"
	case scanner.RawString:
		return "raw string constant"
	case scanner.Comment:
		return "comment"
	default:
		return fmt.Sprintf("%q", rune(t))
	}
}

// NewLexer returns a lexer for the named file and the given link context.
func NewLexer(name string) TokenReader {
	input := NewInput(name)

			"B",
		),
		"THIS.\n",
	},
	{
		"nested #define with args",
		lines(
			"#define A #define B(x) x",
			"A",
			"B(THIS)",
		),
		"THIS.\n",
	},
	/* This one fails. See comment in Slice.Col.
	{
		"nested #define with args",
		lines(
			"#define A #define B (x) x",
			"A",
			"B(THIS)",
		),
		"x.\n",
	},
	*/
}

func TestLex(t *testing.T) {