class MyException : Exception

{

    @nogc @safe pure string annotation() {

        return "";

    }

​

    @nogc @safe pure nothrow this(string msg, string file = __FILE__, size_t line = __LINE__, Throwable nextInChain = null)

    {

        super(msg ~ " " ~ this.annotation, file, line, nextInChain);

    }

​

    @nogc @safe pure nothrow this(string msg, Throwable nextInChain, string file = __FILE__, size_t line = __LINE__)

    {

        super(msg, file, line, nextInChain);

    }

}

​

void main() {

}