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

--- Comment #0 from Andrej Mitrovic <> 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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