[Issue 23709] Cannot use synchronized on shared class with -preview=nosharedaccess

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23709

--- Comment #2 from Atila Neves <atila.neves at gmail.com> ---
Oh, wow. I assumed the problem was with `synchronized` because the problem
being with `new shared Class` was just too fundamental to even consider!

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