[Issue 23175] -preview=in silently adds possible stack memory escape

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23175

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pro.mathias.lang at gmail.com

--- Comment #7 from Mathias LANG <pro.mathias.lang at gmail.com> ---
As was pointed out in the lengthy forum thread:
- `scope` now leads to stack allocation;
- `-preview=in` is supposed to make `in` means `scope const`;

So I don't see how turning on a switch that is supposed to make `in` have the
semantic of `scope` is "silently breaking code" ??
Hello, *the whole point of `-preview`* is to introduce potentially-breaking
changes!

This is working as intended.

--