[Issue 19873] function should be by default @system even with -preview=dip1000

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19873

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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            Summary|unittest should be by       |function should be by
                   |default @system even with   |default @system even with
                   |-preview=dip1000            |-preview=dip1000

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