"cmd/internal/cov/covcmd",
	"internal/bisect",
	"internal/buildcfg",
	"internal/goarch",
	"internal/godebugs",
	"internal/goexperiment",
	"internal/goroot",
	"internal/gover",
	"internal/goversion",
	// internal/lazyregexp is provided by Go 1.17, which permits it to
	// be imported by other packages in this list, but is not provided
	// by the Go 1.17 version of gccgo. It's on this list only to

			// go: directive (but be conservative and test)
			if strings.HasPrefix(text, "go:") {
				if p.top && strings.HasPrefix(msg, "//go:build") {
					if x, err := constraint.Parse(msg); err == nil {
						p.goVersion = constraint.GoVersion(x)
					}
				}
				if pragh != nil {
					p.pragma = pragh(p.posAt(line, col+2), p.scanner.blank, text, p.pragma) // +2 to skip over // or /*
				}
			}
		},
		directives,
	)

		"TESTGONETWORK=panic", // cleared by the [net] condition
		"GOSUMDB=" + testSumDBVerifierKey,
		"GONOPROXY=",
		"GONOSUMDB=",
		"GOVCS=*:all",
		"devnull=" + os.DevNull,
		"goversion=" + gover.Local(),
		"CMDGO_TEST_RUN_MAIN=true",
		"HGRCPATH=",
		"GOTOOLCHAIN=auto",
		"newline=\n",
	}

	if testenv.Builder() != "" || os.Getenv("GIT_TRACE_CURL") == "1" {

	for {
		p.pos, p.tok, p.lit = p.scanner.Scan()
		if p.tok == token.COMMENT {
			if p.top && strings.HasPrefix(p.lit, "//go:build") {
				if x, err := constraint.Parse(p.lit); err == nil {
					p.goVersion = constraint.GoVersion(x)
				}
			}
			if p.mode&ParseComments == 0 {
				continue
			}
		} else {
			// Found a non-comment; top of file is over.
			p.top = false
		}
		break
	}
}

	// determine key/value types
	var key, val Type
	if x.mode != invalid {
		// Ranging over a type parameter is permitted if it has a core type.
		k, v, cause, isFunc, ok := rangeKeyVal(x.typ, func(v goVersion) bool {
			return check.allowVersion(x.expr, v)
		})
		switch {
		case !ok && cause != "":
			check.softErrorf(&x, InvalidRangeExpr, "cannot range over %s: %s", &x, cause)
		case !ok:

	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
	HOME=/no-home
	PATH=<actual PATH>
	TMPDIR=$WORK/tmp
	GODEBUG=<actual GODEBUG>
	devnull=<value of os.DevNull>
	goversion=<current Go version; for example, 1.12>

On Plan 9, the variables $path and $home are set instead of $PATH and $HOME.
On Windows, the variables $USERPROFILE and $TMP are set instead of
$HOME and $TMPDIR.

		opt(&conf)
	}

	// apply flag setting (overrides custom configuration)
	var goexperiment, gotypesalias string
	flags := flag.NewFlagSet("", flag.PanicOnError)
	flags.StringVar(&conf.GoVersion, "lang", "", "")
	flags.StringVar(&goexperiment, "goexperiment", "", "")
	flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
	flags.StringVar(&gotypesalias, "gotypesalias", "", "")

func Read(r io.ReaderAt) (*BuildInfo, error) {
	vers, mod, err := readRawBuildInfo(r)
	if err != nil {
		return nil, err
	}
	bi, err := debug.ParseBuildInfo(mod)
	if err != nil {
		return nil, err
	}
	bi.GoVersion = vers
	return bi, nil
}

type exe interface {
	// ReadData reads and returns up to size bytes starting at virtual address addr.
	ReadData(addr, size uint64) ([]byte, error)

	tg.grepStdout("-ffaster", "CC arguments not found")

	tg.run("env", "GOVERSION")
	envVersion := strings.TrimSpace(tg.stdout.String())

	tg.run("version")
	cmdVersion := strings.TrimSpace(tg.stdout.String())

	// If 'go version' is "go version <version> <goos>/<goarch>", then
	// 'go env GOVERSION' is just "<version>".
	if cmdVersion == envVersion || !strings.Contains(cmdVersion, envVersion) {

		opt(&conf)
	}

	// apply flag setting (overrides custom configuration)
	var goexperiment, gotypesalias string
	flags := flag.NewFlagSet("", flag.PanicOnError)
	flags.StringVar(&conf.GoVersion, "lang", "", "")
	flags.StringVar(&goexperiment, "goexperiment", "", "")
	flags.BoolVar(&conf.FakeImportC, "fakeImportC", false, "")
	flags.StringVar(&gotypesalias, "gotypesalias", "", "")