[Issue 17415] std.conv.emplace does not forward arguments correctly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17415

Andrei Alexandrescu <andrei at erdani.com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrei at erdani.com

--- Comment #3 from Andrei Alexandrescu <andrei at erdani.com> ---
S.init counts as an rvalue. We should treat it for all purposes the same as:

struct S
{
    S init();
    ...
}

The way the value is produced does not entail a copy. Then the rvalue is moved
into the constructor of C, so the code is legit.

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