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digitalmars.D.bugs - [Issue 6257] New: Struct postblit not called in one case

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6257

           Summary: Struct postblit not called in one case
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc


--- Comment #0 from bearophile_hugs eml.cc 2011-07-06 03:27:03 PDT ---
With DMD 2.053 the second assert of this program fires, is this a DMD bug?


struct Foo {
   int[] data;

   this(int n) {
       data.length = n;
   }

   this(this) {
       data = data.dup;
   }
}
void main() {
   Foo f1, f2;
   f1 = Foo(1);
   f2 = f1;
   assert(f1.data.ptr != f2.data.ptr); // OK
   f1 = f2 = Foo(1);
   assert(f1.data.ptr != f2.data.ptr); // asserts
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6257


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2012-05-10 19:52:21 PDT ---
The bug mechanism is:

struct Foo {
   int[] data;
   this(int n) {
       data.length = n;
   }
   this(this) {
       data = data.dup;
   }

   // Implicitly generated by compiler
   ref Foo opAssign(Foo rhs) { ... }
}

void main() {
   ...
   f1 = f2 = Foo(1);
   // is translated to:
   f1.opAssign(f2.opAssign(Foo(1)));  // f2.opAssign returns ref Foo
}

"Postblit not called on ref returned object" is same as bug 6119.
Then, this was a dup of it.

*** This issue has been marked as a duplicate of issue 6119 ***

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prev sibling parent d-bugmail puremagic.com writes:
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--- Comment #2 from Kenji Hara <k.hara.pg gmail.com> 2012-05-10 19:53:28 PDT ---
Sorry, I missed. This is a dup of bug 6199.

*** This issue has been marked as a duplicate of issue 6199 ***

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