http://d.puremagic.com/issues/show_bug.cgi?id=11257

           Summary: Allow whole implicit conversion if one or more
                    overlapped field could.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: k.hara.pg@gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg@gmail.com> 2013-10-14 04:00:35 PDT ---
Compiler rejects this code so the implicit conversion from const(R) to R breaks mutable field 'stripped' const-correctness.

struct R
{
    union
    {
        const(Object) original;
        Object stripped;
    }
}
void main()
{
    const R cr;
    R mr = cr;  // Error: cannot implicitly convert expression
                // (cr) of type const(R) to R
}

However, I think this is a little restricted behavior. Because qualified and overlapped field is D-specific feature. It's mostly used for bypassing the restriction of const qualifier. Therefore, in many case it would be protected by private access specifier.

The feature is necessary in order to allow const(Rebindable) to Rebindable
conversion.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull


--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2013-10-14 05:57:34 PDT ---
https://github.com/D-Programming-Language/dmd/pull/2665

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--- Comment #2 from github-bugzilla@puremagic.com 2013-10-14 20:51:11 PDT ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/0f00e6b6f29707f7a18b6e559aecf6bca50fca90
fix Issue 11257 - Allow whole implicit conversion if one or more overlapped
field could.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


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