the use of cgo, and to 0 to disable it. The go tool will set the
build constraint "cgo" if cgo is enabled. The special import "C"
implies the "cgo" build constraint, as though the file also said
"//go:build cgo".  Therefore, if cgo is disabled, files that import
"C" will not be built by the go tool. (For more about build constraints
see https://golang.org/pkg/go/build/#hdr-Build_Constraints).

pkg encoding/json, type Token interface {}
pkg encoding/json, type UnmarshalTypeError struct, Offset int64
pkg flag, func UnquoteUsage(*Flag) (string, string)
pkg go/ast, type EmptyStmt struct, Implicit bool
pkg go/build, type Package struct, PkgTargetRoot string
pkg go/constant, const Bool = 1
pkg go/constant, const Bool Kind
pkg go/constant, const Complex = 5
pkg go/constant, const Complex Kind
pkg go/constant, const Float = 4

pkg encoding/asn1, const TagUTCTime ideal-int
pkg encoding/asn1, const TagUTF8String = 12
pkg encoding/asn1, const TagUTF8String ideal-int
pkg go/build, const IgnoreVendor = 8
pkg go/build, const IgnoreVendor ImportMode
pkg go/build, type Package struct, InvalidGoFiles []string
pkg go/constant, func ToComplex(Value) Value
pkg go/constant, func ToFloat(Value) Value
pkg go/constant, func ToInt(Value) Value

func (b *Buffer) AvailableBuffer() []byte { return b.buf[len(b.buf):] }

// String returns the contents of the unread portion of the buffer
// as a string. If the [Buffer] is a nil pointer, it returns "<nil>".
//
// To build strings more efficiently, see the strings.Builder type.
func (b *Buffer) String() string {
	if b == nil {
		// Special case, useful in debugging.
		return "<nil>"
	}
	return string(b.buf[b.off:])
}

This setting will be removed in a future release, Go 1.22 at the earliest.

### Go 1.10

Go 1.10 changed how build caching worked and added test caching, along
with the [`gocacheverify`, `gocachehash`, and `gocachetest` settings](/cmd/go/#hdr-Build_and_test_caching).
There is no plan to remove these settings.

### Go 1.6

Go 1.6 introduced transparent support for HTTP/2,

(the actual output may differ from what you see here):
</p>

<pre>
$ cat x.go
package main

func main() {
	println(3)
}
$ GOOS=linux GOARCH=amd64 go tool compile -S x.go        # or: go build -gcflags -S x.go
"".main STEXT size=74 args=0x0 locals=0x10
	0x0000 00000 (x.go:3)	TEXT	"".main(SB), $16-0
	0x0000 00000 (x.go:3)	MOVQ	(TLS), CX
	0x0009 00009 (x.go:3)	CMPQ	SP, 16(CX)
	0x000d 00013 (x.go:3)	JLS	67

	}
	return p.errorCount == 0
}

// nextToken returns the next non-build-comment token from the lexer.
// It reports misplaced //go:build comments but otherwise discards them.
func (p *Parser) nextToken() lex.ScanToken {
	for {
		tok := p.lex.Next()
		if tok == lex.BuildComment {
			if p.sawCode {
				p.errorf("misplaced //go:build comment")
			}
			continue
		}
		if tok != '\n' {
			p.sawCode = true

// The satisfied tags are derived from context but only those that
// matter (the ones listed in the tags argument plus GOOS and GOARCH) are used.
// The tags list, which came from go/build's Package.AllTags,
// is known to be sorted.
func tagKey(dir string, context *build.Context, tags []string) string {
	ctags := map[string]bool{
		context.GOOS:   true,
		context.GOARCH: true,
	}
	if context.CgoEnabled {
		ctags["cgo"] = true
	}

# 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

# CL 155050043 go/build: Return MultiplePackageError on importing a dir containing multiple packages, Jens Frederich <******@****.***>
pkg go/build, method (*MultiplePackageError) Error() string

//
// $GOROOT/misc/ios contains a script, detect.go, that attempts to autodetect these.
package main

import (
	"bytes"
	"encoding/xml"
	"errors"
	"fmt"
	"go/build"
	"io"
	"log"
	"net"
	"os"
	"os/exec"
	"os/signal"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"syscall"
	"time"
)

const debug = false

var tmpdir string

var (