“Out” parameters and destructors

[Ogion]

On Saturday, 15 March 2025 at 20:21:41 UTC, Manfred Nowak wrote:
> If one moves the line containing 'writeln´ one line up before 
> the 'if´-condition, then one might be notified of all 
> calls---and one might be able to recognize more than one call 
> of the destructor.

One who has eyes, let one see:
```D
import std.stdio;
struct S {
     int x;
     this(int x) {
         this.x = x;
         writeln("S(", x, ")");
     }
     ~this() {
         writeln("~S(", x, ")");
     }
}

void foo(out S s) {}

void main() {
     S s = S(42);
     foo(s);
}
```

Output:
```
S(42)
~S(0)
```

Alas, the object instantiated with `S(42)` was not given the 
proper burial. The treacherous function replaced its body with an 
empty shell. Its restless spirit will wander the earth for all 
eternity.