December 29, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=9240

           Summary: (Regression: 2.058) non-const does not implicitly
                    convert to const
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-12-29 08:48:00 PST ---
void ok(const(int*)*) { }
void ng(const(int)**) { }

void main()
{
    int** x;
    ok(x);
    ng(x);
}

'ng' call fails to compile since 2.058

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January 13, 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9240



--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-01-12 19:32:48 PST ---
Introduced by:

commit d3cd1bf6db3689fb16c8f97572ae8bbf92ec9df7
Author: k-hara <k.hara.pg@gmail.com>
Date:   Tue Dec 13 15:03:44 2011 +0900

    Issue 4251 - Hole in the const system: immutable(T)[] implicitly casts to
ref const(T)[]

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January 14, 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9240


yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies@gmail.com
         Resolution|                            |INVALID


--- Comment #2 from yebblies <yebblies@gmail.com> 2013-01-14 22:33:33 EST ---
This is not a bug.  See the examples in issue 4251 for how allowing this would break const.

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--- Comment #3 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-01-14 07:43:19 PST ---
(In reply to comment #2)
> This is not a bug.  See the examples in issue 4251 for how allowing this would break const.

Exact comment which explains this: http://d.puremagic.com/issues/show_bug.cgi?id=4251#c9

I think this could go to the spec as a small note. It was brought up on IRC by someone converting some C++ code to D, and at first sight it seemed like a rejects-valid. A few of us agreed and I filed it, but comment #9 above explains the problem perfectly.

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