Report error for result types with wildcard extends bound

MapStruct does not support result types with an extends bound. For example

import java.util.List;
import org.mapstruct.Mapper;

@Mapper
public interface BoundMapper {
    List<? extends Number> toExtends(List<Integer> in);
}

is invalide, because of the wildcard extends bound ? extends . MapStruct reports this as

Can't generate mapping method for a wildcard extends bound result.

Currently the plugin doesn't report this as an error.

One possible QuickFix could be removing the wildcard extends bound ? extends .

首先在 IntelliJ 中使用 BoundMapper 範例重現問題，並檢查外掛程式如何處理具有 wildcard extends 上界的結果型別。當外掛程式針對此情況回報錯誤，並將移除 ? extends 上界作為可能的 QuickFix 時，即表示完成；payload 未指定原始碼檔案或測試。