声明 为@objc dynamic这个的属性，在使用mapping时无法获取值

@objc dynamic var descrip = ""
func mapping(mapper: HelpingMapper) {
mapper <<<
self.descrip <-- "description"
}

如上代码：
descrip无法通过description获取值

Start with the @objc dynamic property declaration and the mapping(mapper: HelpingMapper) example in the issue, then trace how the "description" key is resolved. Reproduce the case and confirm that descrip receives the description value; the issue does not name a source file or test to run.

Written by the indexing model from the issue text.