[Issue 23639] Casting to shared not allowed with -preview=nosharedaccess

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23639

--- Comment #2 from RazvanN <razvan.nitu1305 at gmail.com> ---
Update, the problem is not the casting. Casting is fine. The problem is the
fact that the result of the cast is a shared expression that is returned,
therefore it needs to be synchronized.

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