[Issue 14402] std.conv.emplace segfaults for nested class

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14402

--- Comment #1 from Matt Kline <mkline.on.d at gmail.com> ---
I just noticed that if you try to `new` a context-aware class or struct outside
that context, you get a nice compiler warning indicating that you cannot do so.
Can we, via template magic or something similar, issue a similar error when
trying to emplace one?

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