func LoadModGraph(ctx context.Context, goVersion string) (*ModuleGraph, error) {
	rs, err := loadModFile(ctx, nil)
	if err != nil {
		return nil, err
	}

	if goVersion != "" {
		v, _ := rs.rootSelected("go")
		if gover.Compare(v, gover.GoStrictVersion) >= 0 && gover.Compare(goVersion, v) < 0 {

		if data, err := os.ReadFile(filepath.Join(dir, "go.mod")); err == nil {
			goVersion := gover.GoModLookup(data, "go")
			if gover.Compare(goVersion, gover.Local()) > 0 {
				return "", &gover.TooNewError{What: mod.String(), GoVersion: goVersion}
			}
		} else if !errors.Is(err, fs.ErrNotExist) {
			return "", err
		}

		return dir, nil
	})
}

	err := check.newError(code)
	err.addf(at, format, args...)
	err.soft = true
	err.report()
}

func (check *Checker) versionErrorf(at poser, v goVersion, format string, args ...any) {
	msg := check.sprintf(format, args...)
	err := check.newError(UnsupportedFeature)
	err.addf(at, "%s requires %s or later", msg, v)
	err.report()
}

pkg go/ast, func NewPackage //deprecated #52463
pkg go/ast, type File struct, GoVersion string #59033
pkg go/ast, type Importer //deprecated #52463
pkg go/ast, type Object //deprecated #52463
pkg go/ast, type Package //deprecated #52463
pkg go/ast, type Scope //deprecated #52463
pkg go/build/constraint, func GoVersion(Expr) string #59033
pkg go/build, type Directive struct #56986

	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.

	err := check.newError(code)
	err.addf(at, format, args...)
	err.soft = true
	err.report()
}

func (check *Checker) versionErrorf(at positioner, v goVersion, format string, args ...any) {
	msg := check.sprintf(format, args...)
	err := check.newError(UnsupportedFeature)
	err.addf(at, "%s requires %s or later", msg, v)
	err.report()
}

// Files

// package PkgName; DeclList[0], DeclList[1], ...
type File struct {
	Pragma    Pragma
	PkgName   *Name
	DeclList  []Decl
	EOF       Pos
	GoVersion string
	node
}

// ----------------------------------------------------------------------------
// Declarations

type (
	Decl interface {
		Node
		aDecl()
	}

	//              Path

		{Name: "GOTMPDIR", Value: cfg.Getenv("GOTMPDIR")},
		{Name: "GOTOOLCHAIN"},
		{Name: "GOTOOLDIR", Value: build.ToolDir},
		{Name: "GOVCS", Value: cfg.GOVCS},
		{Name: "GOVERSION", Value: runtime.Version()},
		{Name: "GODEBUG", Value: os.Getenv("GODEBUG")},
		{Name: "GOTELEMETRY", Value: telemetry.Mode()},
		{Name: "GOTELEMETRYDIR", Value: telemetry.Dir()},
	}

	for i := range env {

func TestSymVersion(t *testing.T) {
	skipIfNotELF(t)

	table := getTable(t)
	if table.go12line == nil {
		t.Skip("not relevant to Go 1.2+ symbol table")
	}
	for _, fn := range table.Funcs {
		if fn.goVersion == verUnknown {
			t.Fatalf("unexpected symbol version: %v", fn)
		}
	}
}

// read115Executable returns a hello world executable compiled by Go 1.15.
//
// The file was compiled in /tmp/hello.go:
//

	if archive != "" {
		ofile = archive
	} else {
		out := "_go_.o"
		ofile = objdir + out
	}

	pkgpath := pkgPath(a)
	defaultGcFlags := []string{"-p", pkgpath}
	if p.Module != nil {
		v := p.Module.GoVersion
		if v == "" {
			v = gover.DefaultGoModVersion
		}
		if allowedVersion(v) {
			defaultGcFlags = append(defaultGcFlags, "-lang=go"+gover.Lang(v))
		}
	}
	if p.Standard {