http://d.puremagic.com/issues/show_bug.cgi?id=10454

           Summary: Hex string generates an Outside Unicode code space
                    error
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: diagnostic, rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-06-23 13:07:50 PDT ---
void main() {
    enum s = x"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF";
    pragma(msg, typeof(s));
    pragma(msg, s.length);
    immutable(char)[16] u16 = x"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF";
}


DMD 2.064alpha gives:


string
16u
test1.d(5): Error: Outside Unicode code space


So 's' is a immutable(char)[] of 16 chars, but that syntax is refused for
'u16'.

Additionally the error message is wrong, according to what's written in the D documentation:

http://dlang.org/lex.html#HexStringChars

>The hex data need not form valid UTF characters.<


See also Issue 10453

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