[Issue 12628] emplace does not work for rvalues

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12628

--- Comment #3 from Andrei Alexandrescu <andrei at erdani.com> ---
(In reply to monarchdodra from comment #2)
> Not mandatory, but would be quite helpful, this needs fixing first:
> https://issues.dlang.org/show_bug.cgi?id=12684

Yah, they kinda go together.

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