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

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6125

           Summary: to!string doesn't throw on invalid UTF sequence
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2011-06-08 11:41:02 PDT ---
I'm not sure if this is a bug or wanted behavior:
    auto x = to!string(cast(char)255);

That won't throw. But this will:
    auto x = to!string(cast(char)255);  // or try 128
    auto z = toUTF8(x);  // throws

I've had this example code translated from C:

    foreach (y; 0 .. 16)
    foreach (x; 0 .. 16)
    {
        auto buffer = to!string(cast(char)(16 * x + y));
        auto result = buffer.toUTF16z;  // call to utf16z for the winapi
    }

Essentially the code builds a table of characters that it prints out. But it
doesn't seem to take into account invalid UTF8 code points.

This leads me to another question, how does one iterate through valid UTF code
points, starting from 0? Is there a Phobos function that does that?

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