http://d.puremagic.com/issues/show_bug.cgi?id=6199

           Summary: [GSoC] Postblit not called when returning a reference
                    to a by-value function.
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: cristi.cobzarenco@gmail.com


--- Comment #0 from Cristi Cobzarenco <cristi.cobzarenco@gmail.com> 2011-06-23 11:14:10 PDT ---
Code:

import std.stdio;

struct Test {
    this( this ) { writeln( "postblit" ); }
    ~this()      { writeln( "destroyed" );    }
}

void takesVal( Test x ) {}
ref Test returnsRef( ref Test x ) { return x; }

int main() {
    Test x;
    takesVal( returnsRef( x ) );
    return 0;
}

--------------
Output:
destroyed
destroyed


So while there is copy getting destroyed, the postblit doesn't get called. The code works fine when passing a ref argument:

Code:
[...]
void f( ref Test x ) {
    takesVal( x );
}

int main() {
    Test x;
    f( x );
}
--------------
Output:
postblit
destroyed
destroyed

This bug is probably related to http://d.puremagic.com/issues/show_bug.cgi?id=5737

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SomeDude <lovelydear@mailmetrash.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lovelydear@mailmetrash.com


--- Comment #1 from SomeDude <lovelydear@mailmetrash.com> 2012-04-24 11:43:49 PDT ---
Bug is confirmed with 2.059

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--- Comment #2 from SomeDude <lovelydear@mailmetrash.com> 2012-05-04 23:01:01 PDT ---
See also related issue 5737 and issue 8045

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, wrong-code
         OS/Version|Windows                     |All


--- Comment #3 from Kenji Hara <k.hara.pg@gmail.com> 2012-05-04 23:32:00 PDT ---
https://github.com/D-Programming-Language/dmd/pull/927

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--- Comment #4 from github-bugzilla@puremagic.com 2012-05-07 18:10:39 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/9c03f1445966163321cf40456f35f83f534f2b1a
fix Issue 6199 - [GSoC] Postblit not called when returning a reference to a
by-value function.

https://github.com/D-Programming-Language/dmd/commit/7f18602f38082d8b837112fed1d5d10b222e3b87 Merge pull request #927 from 9rnsr/fix_postblit

Issue 5737 & 6199 - fix postblit call with ref return

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #5 from Kenji Hara <k.hara.pg@gmail.com> 2012-05-10 19:53:28 PDT ---
*** Issue 6257 has been marked as a duplicate of this issue. ***

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