Second Draft: ref for Variable Declarations

[Walter Bright]

On 5/2/2024 9:19 PM, Nicholas Wilson wrote:
> Your example that purports to show the utility of the new feature is already 
> accomplishable by `alias`
> ```d
> void pop87(int line, const(char)* file)
> {
>      alias g = global87;
>      // ... use `g`
> ```

Not exactly. Accessing global variables takes a varying number of instructions 
depending on the memory model. Using a ref variable makes it a simple pointer. 
An alias is fundamentally different, although in trivial cases they can appear 
to be the same.

There are three ways to refer to a value

1. by value
2. by reference
3. by name

Alias is by name, you'll see it also in ref, alias, and value parameters to 
function templates.