Add proper check for dst pointer

memory.go

@@ -8,7 +8,8 @@ import (
 )
 
 var (
-	MemoryCacheNotExists = errors.New("item does not exist")
+	ErrMemoryCacheNotExists    = errors.New("item does not exist")
+	ErrMemoryCacheNotSupported = errors.New("memory cache does not support retrieving items without a destination pointer")
 )
 
 type MemoryCache struct {
@@ -31,7 +32,11 @@ func (mc *MemoryCache) Get(key string, dst ...interface{}) ([]byte, error) {
 	item, exists := mc.c.Get(key)
 
 	if !exists {
-		return nil, MemoryCacheNotExists
+		return nil, ErrMemoryCacheNotExists
+	}
+
+	if len(dst) == 0 {
+		return nil, ErrMemoryCacheNotSupported
 	}
 
 	v := dst[0]