[Issue 6815] New: Char array is turned into string expression during constant folding

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6815

           Summary: Char array is turned into string expression during
                    constant folding
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dawg at dawgfoto.de


--- Comment #0 from dawg at dawgfoto.de 2011-10-15 20:35:22 PDT ---
struct DChars
{
    dchar foo()
    {
        return ary[0];
    }

    dchar[] ary;
}

DChars get()
{
    DChars s;
    s.ary ~= 'H';
    s.ary ~= 'e';
    return s;
}

enum dchars = get().foo();
----

Which will bark:
Error: cannot cast a read-only string literal to mutable in CTFE

Cat in constfold.c turns null ~ char into a string expression
even though the type of null is not a string but a char array.

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