std.experimental.alloctor does not work with non default constructible types

[Andrei Alexandrescu via Digitalmars-d]

On 6/3/16 8:24 AM, maik klein wrote:
> Thanks, I opened an issue here
> https://issues.dlang.org/show_bug.cgi?id=16117
>
> I just used makeArray because it was just so convenient to use but I
> guess I could also switch to the untyped interface if this proves to be
> a blocker.

Great, thanks. That seems to point at an issue in emplace. Surprisingly 
this recent work by Walter should be able to help: 
https://github.com/dlang/dmd/pull/5830. It makes "union" essentially a 
pure layout design tool. -- Andrei