braceless with statements

[kdevel]

On Friday, 12 November 2021 at 10:59:39 UTC, Stefan Koch wrote:
[...]
> ```D
> {
> with(s):
>  // only vaild for this scope
> }
> // s.x is not valid here anymore
> ```

That's good, but why stop half way? Drop the colon, drop the 
parentheses, allow a comma expression:

    A a; B b; ...; Z z;
    :
    with a, b, ..., z;

which is "lowered" to

    with (a) {
       with (b) {
           :
           with (z) {
              :
           }
           :
       }
       :
    }