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: mux.go
    path of file: ./repos/traefik/pkg/muxer/http
    
    the code of the file until where you have to start completion: package http

import (
	"fmt"
	"net/http"
	"sort"

	"github.com/rs/zerolog/log"
	"github.com/traefik/traefik/v3/pkg/rules"
	"github.com/vulcand/predicate"
)

// Muxer handles routing with rules.
type Muxer struct {
	routes         routes
	parser         pred
    
func (m *matchersTree) match(req *http.Request) bool {
	if m == nil {
		// This should never happen as it should have been detected during parsing.
		log.Warn().Msg("Rule matcher is nil")
		return false
	}

	if m.matcher != nil {
		return m.matcher(req)
	}

	switch m.operator {
	case "or":
		return m.left.match(req) || m.right.match(req)
	case "and":
		return m.left.match(req) && m.right.match(req)
	default:
		// This should never happen as it should have been detected during parsing.
		log.Warn().Str("operator", m.operator).Msg("Invalid rule operator")
		return false
	}
}