opDispatch bug?

[Zhenya]

Hi!
Is it a bug?
class Foo
{
        int m_bar;
        char m_gun;
        @property auto ref opDispatch(string s)()
        {
                return mixin("m_"~s); 
        }
        this(int i,char c)
        {
		bar = i;//Error: undefined identifier bar, did you mean 
variable m_bar?
                this.gun = c;
        }
}