[Issue 18187] std.uni.Grapheme should be usable in @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18187

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
That's great then.
There have been a few changed in std.uni recently, e.g.

https://github.com/dlang/phobos/pull/6041

So maybe these changes made the test @safe
There's also the fact that Phobos's testsuite now uses -dip1000 to test
std.uni, but I just checked and it seems like the tests are now @safe even
without -dip1000 :)

Up for a quick PR?

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