case "freebsd":
			// Copied from golang.org/x/sys/unix/dev_freebsd.go.
			major := uint32((dev >> 8) & 0xff)
			minor := uint32(dev & 0xffff00ff)
			h.Devmajor, h.Devminor = int64(major), int64(minor)
		case "netbsd":
			// Copied from golang.org/x/sys/unix/dev_netbsd.go.
			major := uint32((dev & 0x000fff00) >> 8)
			minor := uint32((dev & 0x000000ff) >> 0)
			minor |= uint32((dev & 0xfff00000) >> 12)

// A lang is a language version broken into major and minor numbers.
type lang struct {
	major, minor int
}

// langWant is the desired language version set by the -lang flag.
// If the -lang flag is not set, this is the zero value, meaning that
// any language version is supported.
var langWant lang

// AllowsGoVersion reports whether local package is allowed
// to use Go version major.minor.
func AllowsGoVersion(major, minor int) bool {

}

func majorMinor(v string) (string, string, bool) {
	firstDot := strings.Index(v, ".")
	if firstDot < 0 {
		return "", "", false
	}
	major := v[:firstDot]
	v = v[firstDot+len("."):]
	endMinor := strings.IndexAny(v, ".-_")
	if endMinor < 0 {
		endMinor = len(v)
	}
	minor := v[:endMinor]
	return major, minor, true

//     current is a newer version, current will be returned (see below).
//
//   - the literal string "patch", denoting the latest available tagged version
//     with the same major and minor number as current (see below).
//
//   - v1, denoting the latest available tagged version v1.x.x.
//
//   - v1.2, denoting the latest available tagged version v1.2.x.
//

// Go version.
//
// Examples:
//
//	Prev("1.2") = "1.1"
//	Prev("1.3rc4") = "1.2"
func Prev(x string) string {
	v := gover.Parse(x)
	if gover.CmpInt(v.Minor, "1") <= 0 {
		return v.Major
	}
	return v.Major + "." + gover.DecInt(v.Minor)
}

// IsValid reports whether the version x is valid.
func IsValid(x string) bool {
	return gover.IsValid(x)

		if !check.validateTArgLen(pos, orig.String(), tparams.Len(), len(targs)) {
			return Typ[Invalid]
		}
		if tparams.Len() == 0 {
			return orig // nothing to do (minor optimization)
		}

		return check.newAliasInstance(pos, orig, targs, ctxt)

	case *Signature:
		assert(expanding == nil) // function instances cannot be reached from Named types

// lexically could have provided the package but did not.
//
// If skipModFile is true, the go.mod file for the package is not loaded. This
// allows 'go mod tidy' to preserve a minor checksum-preservation bug
// (https://go.dev/issue/56222) for modules with 'go' versions between 1.17 and
// 1.20, preventing unnecessary go.sum churn and network access in those
// modules.

	  "go1.1" from Go version 1.1 onward, "go1.12" from Go 1.12, and so on.
	- any additional tags given by the -tags flag (see 'go help build').

There are no separate build tags for beta or minor releases.

If a file's name, after stripping the extension and a possible _test suffix,
matches any of the following patterns:
	*_GOOS
	*_GOARCH
	*_GOOS_GOARCH

			}

			// We need the checksum for the go.mod file for pkg.mod
			// so that we know what Go version to use to compile pkg.
			// However, we didn't do so before Go 1.21, and the bug is relatively
			// minor, so we maintain the previous (buggy) behavior in 'go mod tidy' to
			// avoid introducing unnecessary churn.
			if keepPkgGoModSums {
				r := resolveReplacement(pkg.mod)
				keep[modkey(r)] = true
			}

// packages specified on the command line.
//
// The -u flag instructs get to update modules providing dependencies
// of packages named on the command line to use newer minor or patch
// releases when available.
//
// The -u=patch flag (not -u patch) also instructs get to update dependencies,
// but changes the default to select patch releases.
//