Safety is not what you think

[Basile B.]

On Tuesday, 30 January 2024 at 15:38:26 UTC, Paul Backus wrote:
> [...]
> This definitely isn't allowed in C or C++. I wonder what the 
> rationale is for having this behavior in D?
>
> [1]: https://dlang.org/spec/expression.html

An hypothesis is that this makes codegening the pre and the post 
variants almost identical. The only difference is what is yield. 
[Proof](https://gitlab.com/styx-lang/styx/-/blob/master/src/styx/backend/irgen.sx?ref_type=heads#L3383).

Now there's not much to say about the topic, I just thought it 
was amusing to share that (user1234 is my noname nickname here) 
as people might not realize how much certain expressions allows.

In the same vein you have the possibility to select an lvalue 
with a conditional expression. Pretty sure nobody knows that the 
following is legal

```d
int a,b;
int c = rand();
((c & 3) ? a : b) = 42;
```