[Issue 15924] formattedWrite doesn't write to empty appender

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15924

--- Comment #3 from ag0aep6g at gmail.com ---
(In reply to keepitsimplesirius from comment #2)
> Thanks for explanation. What about making formattedWrite to take argument by
> reference instead of value?

That would make your code work, but it would break other reasonable code that's
probably already out there. Like this:
----
string buffer;
formattedWrite(appender(&buffer), "foo");
----

`auto ref` may be an option.

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