https://issues.dlang.org/show_bug.cgi?id=18844

--- Comment #1 from FeepingCreature <default_357-line@yahoo.de> ---
Repro:

    string s = cast(string) [cast(ubyte) 'ä', 't'];
    size_t i = 0;
    auto ch = decode!(UseReplacementDchar.yes, string)(s, i);
    writefln("ch = %s, i = %s, should be 1", ch, i);

ch = �, i = 2, should be 1.

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https://issues.dlang.org/show_bug.cgi?id=18844

Iain Buclaw <ibuclaw@gdcproject.org> changed:

           What    |Removed                     |Added
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           Priority|P1                          |P4

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https://issues.dlang.org/show_bug.cgi?id=18844

Ate Eskola <Ajieskola@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |Ajieskola@gmail.com

--- Comment #2 from Ate Eskola <Ajieskola@gmail.com> ---
Additional observation: the documentation is misleading with both the present and proposed behaviour. It says "If the code point is not well-formed, then a UTFException is thrown and index remains unchanged.".

Well, we don't throw here since we're using replacement characters, so maybe it's a hint that the part about index remaining unchanged does not apply either. On the other hand, the documentation doesn't say what happens to the index instead. At least for me, it gave the wrong impression that index wouldn't be advanced.

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