[Issue 18024] checkedint.Warn should be @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18024

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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            Summary|checkedint should be usable |checkedint.Warn should be
                   |in @safe nothrow pure @nogc |@safe

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