http://d.puremagic.com/issues/show_bug.cgi?id=4616

           Summary: Link error with copy constructor of nested struct
           Product: D
           Version: D2
          Platform: x86
        OS/Version: All
            Status: NEW
          Keywords: link-failure
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: rsinfu@gmail.com


--- Comment #0 from Shin Fujishiro <rsinfu@gmail.com> 2010-08-10 21:42:57 PDT ---
If a struct N is nested inside another struct S and N has a field of type S, then defining a copy constructor of N causes a linker error.

The error occurs only when N has a field of type S.

-------------------- test.d
struct S
{
    struct N
    {
        S s;
        this(this) {}   // error
    }
}
--------------------

The error on FreeBSD:
--------------------
% dmd test.d
test.o(.text._D4test1S1N8__cpctorMFKS4test1S1NZv+0x18): In function
`_D4test1S1N8__cpctorMFKS4test1S1NZv':
: multiple definition of `_D4test1S1N8__cpctorMFKS4test1S1NZv'
test.o(.text._D4test1S1N8__cpctorMFKS4test1S1NZv+0x0): first defined here
--------------------

The error on Windows:
--------------------
>dmd test.d
OPTLINK (R) for Win32  Release 8.00.2
Copyright (C) Digital Mars 1989-2009  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
test.obj(test)  Offset 00403H Record Type 00C3
 Error 1: Previous Definition Different : _D4test1S1N8__cpctorMFKS4test1S1NZv
--------------------

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Dmitry S <ds.dlang@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ds.dlang@gmail.com


--- Comment #1 from Dmitry S <ds.dlang@gmail.com> 2012-12-17 01:45:51 PST ---
This no longer seems to be reproducible. With dmd compiled from the current
head, the following code (a bit more involved to test it better) compiles and
works (on MacOSX):

    import std.stdio;

    struct S {
        struct N {
            S s;
            this(this) { s.value += 1; }
        }
        int value = 17;
    }

    int main() {
        S.N n1;
        S.N n2 = n1;
        writefln("%d %d", n1.s.value, n2.s.value);
        return 0;
    }

Prints "17 18".

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