http://d.puremagic.com/issues/show_bug.cgi?id=6606

           Summary: RefCounted doesn't work with unions due to use of
                    format
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: dsimcha@yahoo.com


--- Comment #0 from David Simcha <dsimcha@yahoo.com> 2011-09-05 17:24:01 PDT ---
import std.typecons;

struct S {
    U u;
}

union U {
    size_t i;
    void* p;
}

alias RefCounted!(S) SRC;

C:\dmd2\windows\bin\..\..\src\phobos\std\format.d(1853): Error: static assert
"unable to format union object because it does not have toString"
C:\dmd2\windows\bin\..\..\src\phobos\std\format.d(1982):        instantiated
from here: formatValue!(Appender!(string),U,char)
C:\dmd2\windows\bin\..\..\src\phobos\std\format.d(309):        instantiated
from here: formatGeneric!(Appender!(string),U,immutable(char))
C:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(511):        instantiated
from here: formattedWrite!(Appender!(string),immutable(char),U)
    ... (4 instantiations, -v to show) ...
C:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(2386):        instantiated
from here: Tuple!(S,"_payload",uint,"_count")
C:\code\test.d(12):        instantiated from here: RefCounted!(S)

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--- Comment #1 from David Simcha <dsimcha@yahoo.com> 2011-09-05 17:36:26 PDT ---
Actually, it's a problem with Tuple or format, depending on how you look at it.
 This doesn't work either, for basically the same reason:

import std.typecons;

union U {
    size_t i;
    void* p;
}

alias Tuple!U T;

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klickverbot <code@klickverbot.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |code@klickverbot.at


--- Comment #2 from klickverbot <code@klickverbot.at> 2011-09-05 19:19:33 PDT ---
When did this first appear? 2.055 beta? Probably related to https://github.com/D-Programming-Language/phobos/pull/126.

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--- Comment #3 from David Simcha <dsimcha@yahoo.com> 2011-09-05 19:23:22 PDT ---
(In reply to comment #2)
> When did this first appear? 2.055 beta? Probably related to https://github.com/D-Programming-Language/phobos/pull/126.

Yes, in the second 2.055 beta.  It probably is related to the pull you suggest, because it wasn't in the first beta, but it was in the second.

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #4 from Kenji Hara <k.hara.pg@gmail.com> 2011-09-06 00:04:34 PDT ---
https://github.com/D-Programming-Language/phobos/pull/242

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Jonathan M Davis <jmdavisProg@gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jmdavisProg@gmx.com
         Resolution|                            |FIXED


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