You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: filter.go
    path of file: ./repos/sliver/vendor/tailscale.com/wgengine/filter
    
    the code of the file until where you have to start completion: // Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause

// Package filter is a stateful packet filter.
package filter

import (
	"fmt"
	"net/netip"
	"slices"
	"sync"
	"time"

	"go4.org/netipx"
	"tailscale.com/envknob"
	"tailscale.com/net/flowtrack"
	"tailscale.com/net/netaddr"
	"tailscale.com/net/packet"
	"tailscale.com/tailcfg"
	"tailscale.com/tst
    
func NewAllowAllForTest(logf logger.Logf) *Filter {
	any4 := netip.PrefixFrom(netaddr.IPv4(0, 0, 0, 0), 0)
	any6 := netip.PrefixFrom(netip.AddrFrom16([16]byte{}), 0)
	ms := []Match{
		{
			IPProto: []ipproto.Proto{ipproto.TCP, ipproto.UDP, ipproto.ICMPv4},
			Srcs:    []netip.Prefix{any4},
			Dsts: []NetPortRange{
				{
					Net: any4,
					Ports: PortRange{
						First: 0,
						Last:  65535,
					},
				},
			},
		},
		{
			IPProto: []ipproto.Proto{ipproto.TCP, ipproto.UDP, ipproto.ICMPv6},
			Srcs:    []netip.Prefix{any6},
			Dsts: []NetPortRange{
				{
					Net: any6,
					Ports: PortRange{
						First: 0,
						Last:  65535,
					},
				},
			},
		},
	}

	var sb netipx.IPSetBuilder
	sb.AddPrefix(any4)
	sb.AddPrefix(any6)
	ipSet, _ := sb.IPSet()
	return New(ms, ipSet, ipSet, nil, logf)
}