Used private member variable warning is not used

[may11544]

package lru

import (
	"sync"

	"errors"
	"github.com/hashicorp/golang-lru/v2/simplelru"
)

type LRU[K comparable, V any] struct {
	lock sync.Mutex
	lru  *simplelru.LRU[K, V]
}

// NewLRU constructs an LRU of the given size
func NewLRU[K comparable, V any](size int, onEvict simplelru.EvictCallback[K, V]) (*LRU[K, V], error) {
	if size <= 0 {
		return nil, errors.New("must provide a positive size")
	}
	c := &LRU[K, V]{
		lock: sync.Mutex{},
	}
	if l, err := simplelru.NewLRU[K, V](size, onEvict); err != nil {
		return nil, err
	} else {
		c.lru = l
	}
	return c, nil
}

// RemoveOldestN _
func (l *LRU[K, V]) RemoveOldestN(number int) (values []V) {
	l.lock.Lock()
	defer l.lock.Unlock()
	for i := 0; i < number; i++ {
		if _, v, ok := l.lru.RemoveOldest(); ok {
			values = append(values, v)
		} else {
			return
		}
	}
	return
}

I'm sure the RemoveOldestN method is called somewhere else，But it still errors out lock is unused (structcheck) and lru is unused (structcheck)

[ldez]

Hello,

structcheck is deprecated, you should not use it.

I recommend updating your golangci-lint version.