func validatePort(port int) error {
	if 1 <= port && port <= 65535 {
		return nil
	}
	return fmt.Errorf("port number %d must be in the range 1..65535", port)
}

// Validate tests if the Options has valid params.
func (o Options) Validate() error {
	var errs *multierror.Error
	if err := validatePort(int(o.Port)); err != nil {
		errs = multierror.Append(errs, err)
	}
	return errs.ErrorOrNil()

	MOVM.IA	[R2-R5], (R1)
	MOVW	$SYS_SEEK, R0		// syscall num
	SWI		$0
	CMP		$-1, R0
	B.EQ	seekerr
	MOVW	$·emptystring+0(SB), R2
	B		seekok
seekerr:
	MOVW	R0, 0(R6)
	MOVW	R0, 4(R6)
	BL		·errstr(SB)
	MOVW	$ret-20(SP), R2
seekok:
	MOVW	$err+28(FP), R1
	MOVM.IA	(R2), [R3-R4]
	MOVM.IA	[R3-R4], (R1)

package runtime

import (
	"internal/abi"
	"unsafe"
)

//go:linkname plugin_lastmoduleinit plugin.lastmoduleinit
func plugin_lastmoduleinit() (path string, syms map[string]any, initTasks []*initTask, errstr string) {
	var md *moduledata
	for pmd := firstmoduledata.next; pmd != nil; pmd = pmd.next {
		if pmd.bad {
			md = nil // we only want the last module
			continue
		}
		md = pmd
	}
	if md == nil {

//func setfpmasks()
// Only used by the 64-bit runtime.
TEXT runtime·setfpmasks(SB),NOSPLIT,$0
	RET

#define ERRMAX 128	/* from os_plan9.h */

// func errstr() string
// Only used by package syscall.
// Grab error string due to a syscall made
// in entersyscall mode, without going
// through the allocator (issue 4994).
// See ../syscall/asm_plan9_arm.s:/·Syscall/
TEXT runtime·errstr(SB),NOSPLIT,$0-8

func Open(path string, mode int) (fd int, err error) {
	fixwd()
	return open(path, mode)
}

//sys	create(path string, mode int, perm uint32) (fd int, err error)

func Create(path string, mode int, perm uint32) (fd int, err error) {
	fixwd()
	return create(path, mode, perm)
}

//sys	remove(path string) (err error)

func Remove(path string) error {
	fixwd()

func Wstat(path string, edir []byte) (err error) {
	if fixwd(path) {
		defer runtime.UnlockOSThread()
	}
	return wstat(path, edir)
}

//sys	chdir(path string) (err error)
//sys	Dup(oldfd int, newfd int) (fd int, err error)
//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
//sys	Close(fd int) (err error)

	"errors"
	"fmt"
)

var ErrPartialAdd = errors.New("partial add error")

type PartialAddError struct {
	inner error
}

func (e *PartialAddError) Error() string {
	return fmt.Sprintf("%s: %v", ErrPartialAdd.Error(), e.inner)
}

func (e *PartialAddError) Unwrap() []error {
	return []error{ErrPartialAdd, e.inner}
}

func NewErrPartialAdd(err error) *PartialAddError {
	return &PartialAddError{
		inner: err,
	}

func (e *SyscallError) Unwrap() error { return e.Err }

// Timeout reports whether this error represents a timeout.
func (e *SyscallError) Timeout() bool {
	t, ok := e.Err.(timeout)
	return ok && t.Timeout()
}

// NewSyscallError returns, as an error, a new [SyscallError]
// with the given system call name and error details.
// As a convenience, if err is nil, NewSyscallError returns nil.

	e := fmt.Errorf(format, a...)
	ee := Error{}
	ee.msg = e.Error()
	ee.cause = errors.Unwrap(e)
	return ee
}

// Unwrap the internal error.
func (e Error) Unwrap() error { return e.cause }

// Error 'error' compatible method.
func (e Error) Error() string {
	if e.msg == "" {
		return "crypto: cause <nil>"
	}
	return e.msg
}

var (
	// ErrInvalidEncryptionMethod indicates that the specified SSE encryption method

import (
	"fmt"
	"text/template/parse"
)

// Error describes a problem encountered during template Escaping.
type Error struct {
	// ErrorCode describes the kind of error.
	ErrorCode ErrorCode
	// Node is the node that caused the problem, if known.
	// If not nil, it overrides Name and Line.
	Node parse.Node
	// Name is the name of the template in which the error was encountered.
	Name string