[Issue 15710] Replacement for std.utf.validate which does not throw

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15710

berni44 <bugzilla at d-ecke.de> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla at d-ecke.de
             Blocks|                            |16262


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=16262
[Issue 16262] assumeUTF attributes change between debug and release mode
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