[Issue 7084] New: Missing writeln Unicode normalization

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http://d.puremagic.com/issues/show_bug.cgi?id=7084

           Summary: Missing writeln Unicode normalization
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-12-09 01:12:59 PST ---
In this program the string 'txt1' contains two codepoints: LATIN CAPITAL LETTER
A, and COMBINING DIAERESIS.

I think a good printing function has to perform Unicode normalization and show
a single \U000000C4 (LATIN CAPITAL LETTER A WITH DIAERESIS) glyph. But with DMD
2.057beta it shows two glyphs (on Windows), an 'A' followed by a diaeresis.

writeln(txt2) shows what I think is the correct output for writeln(txt1) too:


import std.stdio;
void main() {
    dstring txt1 = "\U00000041\U00000308"d;
    writeln(txt1);
    dstring txt2 = "\U000000C4"d;
    writeln(txt2);
}

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