[Issue 6125] to!string doesn't throw on invalid UTF sequence

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6125

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

           What    |Removed                     |Added
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                 CC|                            |bugzilla at d-ecke.de
                 OS|Windows                     |All

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