First Draft: ref For Variable Declarations

[Walter Bright]

On 4/13/2024 11:22 AM, Dukc wrote:
> This compiles and does nothing:
> 
> ```D
> @safe void main()
> {
>      foreach(ref el; 0 .. 5) el = 42;
> }
> ```

https://issues.dlang.org/show_bug.cgi?id=24499


> No problem - but the dip should explicitly say it's for local variables then, 
> not for variables in general.

The DIP does say:

"There doesn't appear to be a downside of using ref for such declarations, so by 
extension ordinary local variables should also benefit from being declared as ref."

Though it could be made more explicit.