[Issue 23035] -preview=rvaluerefparam causes @system function to be @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23035

--- Comment #2 from Atila Neves <atila.neves at gmail.com> ---
That's... weird, especially since that assert is part of the druntime test
suite.

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