[Issue 18110] most of phobos should be @safe-ly useable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18110

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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         Depends on|                            |18024


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=18024
[Issue 18024] checkedint.Warn should be @safe
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