Simple code:

http://pastebin.com/raw.php?i=7jVeMFXQ

This code works compiled by DMD v2.066.1 and LDC2 (0.15.1) based
on DMD v2.066.1 and LLVM 3.5.0.

$ ./z
TUQLUE
42
11

Compiled by DMD v2.067.1 the program crashes:
$ ./aa
TUQLUE
Segmentation fault

What I'm doing wrong?

On Mon, 04 May 2015 08:48:45 +0000
Fyodor Ustinov via Digitalmars-d <digitalmars-d@puremagic.com> wrote:

> Simple code:
> 
> http://pastebin.com/raw.php?i=7jVeMFXQ
> 
> This code works compiled by DMD v2.066.1 and LDC2 (0.15.1) based
> on DMD v2.066.1 and LLVM 3.5.0.
> 
> $ ./z
> TUQLUE
> 42
> 11
> 
> Compiled by DMD v2.067.1 the program crashes:
> $ ./aa
> TUQLUE
> Segmentation fault
> 
> What I'm doing wrong?

I think it is releted with this chage: http://dlang.org/changelog.html#heap-struct-destructors

So your code has been probably wrong before, but accidentally works

On Monday, 4 May 2015 at 08:48:47 UTC, Fyodor Ustinov wrote:
> Simple code:
>
> http://pastebin.com/raw.php?i=7jVeMFXQ
>
> This code works compiled by DMD v2.066.1 and LDC2 (0.15.1) based
> on DMD v2.066.1 and LLVM 3.5.0.
>
> $ ./z
> TUQLUE
> 42
> 11
>
> Compiled by DMD v2.067.1 the program crashes:
> $ ./aa
> TUQLUE
> Segmentation fault
>
> What I'm doing wrong?

Reduced it a little:

----
module z;

import std.stdio;
import std.concurrency;
import core.thread;

struct Variant {
    void function() fptr = &handler;
    static void handler() {}

    ~this() {
        fptr();
    }
}

void _get(Tid id) {
    id.send(Variant());
}

void supervisor() {
    receive(&_get);
}

void main() {
    Tid supervisorTid = spawn(&supervisor);
    supervisorTid.send(thisTid);
writeln("TUQLUE");
    receive(
        (Variant a) {}
    );
writeln("42");
    thread_joinAll();
}
----

On Monday, 4 May 2015 at 12:19:27 UTC, anonymous wrote:
> On Monday, 4 May 2015 at 08:48:47 UTC, Fyodor Ustinov wrote:
>> Simple code:
>>
>> http://pastebin.com/raw.php?i=7jVeMFXQ
>>
>> This code works compiled by DMD v2.066.1 and LDC2 (0.15.1) based
>> on DMD v2.066.1 and LLVM 3.5.0.
>>
>> $ ./z
>> TUQLUE
>> 42
>> 11
>>
>> Compiled by DMD v2.067.1 the program crashes:
>> $ ./aa
>> TUQLUE
>> Segmentation fault
>>
>> What I'm doing wrong?
>

>     ~this() {
>         fptr();
>     }
    ~this() {
        writeln(fptr);
        fptr();
    }

$ ./aa
TUQLUE
464E70
464E70
464E70
464E70
464E70
464E70
464E70
464E70
464E70
464E70
464E70
6C2AD0
Segmentation fault

OMG.

On Monday, 4 May 2015 at 08:48:47 UTC, Fyodor Ustinov wrote:
> Simple code:
>
> http://pastebin.com/raw.php?i=7jVeMFXQ
>
> This code works compiled by DMD v2.066.1 and LDC2 (0.15.1) based
> on DMD v2.066.1 and LLVM 3.5.0.
>
> $ ./z
> TUQLUE
> 42
> 11
>
> Compiled by DMD v2.067.1 the program crashes:
> $ ./aa
> TUQLUE
> Segmentation fault
>
> What I'm doing wrong?

I investigated this further. std.variant is to blame. I filed an issue an made a pull request to fix it:

https://issues.dlang.org/show_bug.cgi?id=14585
https://github.com/D-Programming-Language/phobos/pull/3284