Question mark operator proposals

[Basile B.]

On Friday, 12 May 2023 at 13:02:25 UTC, Dadoum wrote:
> There were at some point discussions in the forum about error 
> handling and adding a potential question mark operator in D,

Sigh, yes I remember that topic.

This lead to an attempt but unfortunately that did not work.
A few links for those interested to understand what happened:

- 
https://forum.dlang.org/post/xtsvjsqyhxtvvhkdytfx@forum.dlang.org
- https://forum.dlang.org/post/ot1q8b$23pt$1@digitalmars.com
- https://github.com/dlang/dmd/pull/7242

After all these years, I find that finally the most usefull 
variation is actually the
optional assignment

```d
if (!a)
     a = b;
// becomes
a ?= b;
```

faster to lex and parse (9 tokens VS 4), easy to read, but the 
main asset is that it is reusable in subexpressions, e.g call 
arguments. The optional assignment is my favorite niche 
expression lately.