[OT] OT: Null checks.

[kdevel]

On Tuesday, 6 May 2025 at 06:11:29 UTC, Walter Bright wrote:
> D is set up so if you throw an `Exception`, then destructors 
> will run as the stack unwinds. But if you throw an `Error`, you 
> can catch it but the destructors don't run.

I cannot confirm this:

```
$ cat errors.d
import std;

struct S {
    this (int) { writeln (__PRETTY_FUNCTION__); }
    ~this () { writeln (__PRETTY_FUNCTION__); }
}

int baz ()
{
    auto s = S (2);
    throw new Error ("ex");
    return 0;
}

int main ()
{
    try return baz;
    catch (Throwable t)
       stderr.writeln (t.msg);
    return 1;
}
$ dmd -O errors.d
$ ./errors
S errors.S.this(int __param_0) ref
void errors.S.~this()
ex
```