package main

func f[T any](x interface{}) T {
	return x.(T)
}
func f2[T any](x interface{}) (T, bool) {
	t, ok := x.(T)
	return t, ok
}

type I interface {
	foo()
}

type myint int

func (myint) foo() {
}

type myfloat float64

func (myfloat) foo() {
}

func g[T I](x I) T {
	return x.(T)
}
func g2[T I](x I) (T, bool) {
	t, ok := x.(T)
	return t, ok
}

Keith Randall <******@****.***> 1627346462 -0700

type Sockets map[syscall.Handle]Status

func (sw *Switch) sockso(s syscall.Handle) *Status {
	sw.smu.RLock()
	defer sw.smu.RUnlock()
	so, ok := sw.sotab[s]
	if !ok {
		return nil
	}
	return &so
}

// addLocked returns a new Status without locking.
// sw.smu must be held before call.
func (sw *Switch) addLocked(s syscall.Handle, family, sotype, proto int) *Status {
	sw.once.Do(sw.init)

func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only bool, laddr, raddr sockaddr, ctrlCtxFn func(context.Context, string, string, syscall.RawConn) error) (fd *netFD, err error) {
	s, err := sysSocket(family, sotype, proto)
	if err != nil {
		return nil, err
	}
	if err = setDefaultSockopts(s, family, sotype, ipv6only); err != nil {
		poll.CloseFunc(s)
		return nil, err
	}

import (
	"internal/syscall/windows"
	"syscall"
)

// WSASocket wraps [syscall.WSASocket].
func (sw *Switch) WSASocket(family, sotype, proto int32, protinfo *syscall.WSAProtocolInfo, group uint32, flags uint32) (s syscall.Handle, err error) {
	sw.once.Do(sw.init)

	so := &Status{Cookie: cookie(int(family), int(sotype), int(proto))}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterSocket]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {

	switch fd.family {
	case syscall.AF_INET, syscall.AF_INET6:
		switch fd.sotype {
		case syscall.SOCK_STREAM:
			return sockaddrToTCP
		case syscall.SOCK_DGRAM:
			return sockaddrToUDP
		case syscall.SOCK_RAW:
			return sockaddrToIP
		}
	case syscall.AF_UNIX:
		switch fd.sotype {
		case syscall.SOCK_STREAM:
			return sockaddrToUnix
		case syscall.SOCK_DGRAM:
			return sockaddrToUnixgram

// (except for shared nodes like ONAME, ONONAME, OLITERAL, and OTYPE).
// If pos.IsKnown(), it sets the source position of newly allocated Nodes to pos.
func DeepCopy(pos src.XPos, n Node) Node {
	var edit func(Node) Node
	edit = func(x Node) Node {
		switch x.Op() {
		case ONAME, ONONAME, OLITERAL, ONIL, OTYPE:
			return x
		}
		x = Copy(x)
		if pos.IsKnown() {
			x.SetPos(pos)
		}

    46: 0000000000404050     0 NOTYPE  GLOBAL DEFAULT   25 __data_start
    47: 0000000000404198     0 NOTYPE  GLOBAL DEFAULT   26 _end
    48: 0000000000404060     0 NOTYPE  GLOBAL DEFAULT   26 __bss_start
    49: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND _ZNSt8ios_base4I[...]
    50: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND _ZNSolsEi@GLIBCXX_3.4
    51: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__

// Socket wraps [syscall.Socket].
func (sw *Switch) Socket(family, sotype, proto int) (s int, err error) {
	sw.once.Do(sw.init)

	so := &Status{Cookie: cookie(family, sotype, proto)}
	sw.fmu.RLock()
	f := sw.fltab[FilterSocket]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return -1, err
	}
	s, so.Err = syscall.Socket(family, sotype, proto)
	if err = af.apply(so); err != nil {
		if so.Err == nil {

		for _, off := range offs {
			typ := (*rtype)(resolveTypeOff(rodata, off))
			r = append(r, typ.String())
		}
	}
	return r
}

var GCBits = gcbits

func gcbits(any) []byte // provided by runtime

func MapBucketOf(x, y Type) Type {
	return toType(bucketOf(x.common(), y.common()))
}

func CachedBucketOf(m Type) Type {
	t := m.(*rtype)
	if Kind(t.t.Kind_&abi.KindMask) != Map {