Bug 4616 – Link error with copy constructor of nested struct

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 --------------------

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".

Seems fixed from 2.056.