[Issue 10950] New: [CTFE] enum "char[]" not correctly duplicated when used.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10950

           Summary: [CTFE] enum "char[]" not correctly duplicated when
                    used.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: monarchdodra at gmail.com


--- Comment #0 from monarchdodra at gmail.com 2013-09-02 04:50:59 PDT ---
//----
enum char[] s = "hello".dup;

void main()
{
  auto s1 = s;
  auto s2 = s;
  assert (s1.ptr != s2.ptr); //Fails;

  s1[0] = 'j';

  assert(s != "jello"); //Fails
}
//----

This is a pernicious issue, as it effectively modifies what is expected to be
immutable initialization. In particular, it is triggered by the real life code:
enum char[] s = to!(char[])("hello");
enum char[] s = to!(char[])(1);
Where the "to!char[]" is written *specifically* to allow un-aliased write
access.

This behavior was seen on DMD.2.063.2 on windows. I'll test linux later.

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