[Issue 17861] UTF Decode fails with exception

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17861

--- Comment #2 from Etienne <etcimon at gmail.com> ---
That's not terribly useful as it is hidden behind the whole of std.string,
which is what actually deals with UTF8 text.

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