[Issue 18099] betterC check throw statements error!

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18099

--- Comment #1 from changlon <changlon at gmail.com> ---
======
        struct D()
        {
                struct V {
                        ~this() {
                        }
                }
                auto get() {
                        V v ;
                        return v ;
                }
        }
        alias T = D!();
======

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