http://d.puremagic.com/issues/show_bug.cgi?id=5907

           Summary: CTFE: Ref assignments are noop at compile time
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2011-04-28 17:05:20 PDT ---
auto ok()
{
    int[2] result;
    foreach (index, ref sample; result)
    {
        result[index] = 1;
    }
    return result;
}

auto fail()
{
    int[2] result;
    foreach (index, ref sample; result)
    {
        sample = 1;
    }
    return result;
}

float[2] ctfe_ok   = ok();
float[2] ctfe_fail = fail();

void main()
{
    assert(ok == [1, 1]);       // ok
    assert(fail == [1, 1]);     // ok

    assert(ctfe_ok == [1, 1]);
    assert(ctfe_fail == [1, 1]);    // throws
}

Unfortunately they fail silently and then you have bugs in your code. I'm not sure but maybe this bug was reported already? (or a fix is scheduled for the next release?)

I couldn't be sure so I'm reporting it just in case.

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--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2011-04-28 17:07:42 PDT ---
Oh btw sorry about using float[2] instead of int[2] there. I was quickly converting some existing code. The bug is still there if ctfe_ok and ctfe_fail are typed as ints.

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |clugdbug@yahoo.com.au
         Resolution|                            |DUPLICATE


--- Comment #2 from Don <clugdbug@yahoo.com.au> 2011-05-06 01:48:14 PDT ---
dup of 1330, which is fixed.

*** This issue has been marked as a duplicate of issue 1330 ***

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