我如何解析从c#-6到c#-5的代码

我有一个在#2015 c#6中写的ac #project.有两行我正在收到错误:

public override bool Confirmed => true;
public override bool Responded { get; }

我怎么解析它到c#5？谢谢

该行public override bool Confirmed => true是C#6的新语法糖,相当于:

public override bool Confirmed
{
    get { return true; }
}