[Issue 24098] Safe variable can be initialized from `@system` static constructor.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24098

--- Comment #1 from timon.gehr at gmx.ch ---
Actually, depending on how exactly you interpret "create unsafe values", I
guess my `main` function may not violate requirement 2. However, I think this
is still a problem for memory safety in D and worth addressing.

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