[Issue 3784] New: Interpretation of hex string and escape sequences unclear

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3784

           Summary: Interpretation of hex string and escape sequences
                    unclear
           Product: D
           Version: 2.040
          Platform: All
               URL: http://digitalmars.com/d/2.0/lex.html
        OS/Version: All
            Status: NEW
          Keywords: spec
          Severity: normal
          Priority: P2
         Component: www.digitalmars.com
        AssignedTo: nobody at puremagic.com
        ReportedBy: jlquinn at optonline.net


--- Comment #0 from Jerry Quinn <jlquinn at optonline.net> 2010-02-08 19:20:07 PST ---
Are the contents of a hex string interpreted as bytes or as the postfix
indicates?

string a = x"fedcfedc"; // compiles
dstring b = x"fedcfedc"d; // error - illegal unicode.

The compiler apparently considers the double-quoted contents to be UTF-8 that
must be converted to UTF-32 due to the 'd' postfix.  The spec does not make
this clear.  It is reasonable to read the spec as allowing the second
declaration.

A similar question exists about escape sequences since these are deemed
equivalent to:

string c = "\xfe\xdc\xfe\xdc";
dstring d = "\xfe\xdc\xfe\xdc"d;

Also, is 'd' equivalent to:

dstring e = "\ufedc\ufedc"d;

or

dstring f = "\Ufedcfedc"d;

both of which are illegal unicode?

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