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: compat_policy.go
    path of file: ./repos/sliver/vendor/github.com/google/nftables
    
    the code of the file until where you have to start completion: package nftables

import (
	"fmt"

	"github.com/google/nftables/expr"
	"golang.org/x/sys/unix"
)

const nft_RULE_COMPAT_F_INV uint32 = (1 << 1)
const nft_RULE_COMPAT_F_MASK uint32 = nft_RULE_COMPAT_F_INV

// Used by xt match or target like xt_tcpudp to set compat policy between xtables and nftables
// https://elixir.bootlin.com/linux/v5.12/source/net/netfilter/nft_compat.c#L187
type compatPolicy struct {
	Proto uint32
	Flag  uint32
}

var xtMatchCompatMap map[string]*compatPolicy = map[string]*compatPolicy{
	"tcp": {
		Proto: unix.IPPROTO_TCP,
	},
	"udp": {
		Proto: unix.IPPROTO_UDP,
	},
	"udplite": {
		Proto: unix.IPPROTO_UDPLITE,
	},
	"tcpmss": {
		Proto: unix.IPPROTO_TCP,
	},
	"sctp": {
		Proto: unix.IPPROTO_SCTP,
	},
	"osf": {
		Proto: unix.IPPROTO_TCP,
	},
	"ipcomp": {
		
    
func getCompatPolicy(exprs []expr.Any) (*compatPolicy, error) {
	var exprItem expr.Any
	var compat *compatPolicy

	for _, iter := range exprs {
		var tmpExprItem expr.Any
		var tmpCompat *compatPolicy
		switch item := iter.(type) {
		case *expr.Match:
			if compat, ok := xtMatchCompatMap[item.Name]; ok {
				tmpCompat = compat
				tmpExprItem = item
			} else {
				continue
			}
		case *expr.Target:
			if compat, ok := xtTargetCompatMap[item.Name]; ok {
				tmpCompat = compat
				tmpExprItem = item
			} else {
				continue
			}
		default:
			continue
		}
		if compat == nil {
			compat = tmpCompat
			exprItem = tmpExprItem
		} else if *compat != *tmpCompat {
			return nil, fmt.Errorf("%#v and %#v has conflict compat policy %#v vs %#v", exprItem, tmpExprItem, compat, tmpCompat)
		}
	}
	return compat, nil
}