Re: Globals (more ruminations)

[Jim Whitehead II <jnwhiteh@...>]

On Thu, Jul 15, 2010 at 1:33 PM, Patrick Donnelly <batrick@batbytes.com> wrote:
> On Thu, Jul 15, 2010 at 8:18 AM, Roberto Ierusalimschy
> <roberto@inf.puc-rio.br> wrote:
>>> I think I like what Roberto Ierusalimschy is suggesting, assuming I'm
>>> understanding it correctly. Here's how I see a "global" declaration
>>> keyword working:
>>>
>>> [...]
>>
>> Your interpretation (so far, at least) is correct.
>
> I may misunderstand but from his code:
>
>>> a = 10;         --  a is a global (global assignment checking isn't enabled yet)
>>> b = 20;         --  b is a global too
>>>
>>> global checks;  --  using the global keyword turn global assignment checking on.
>                   --  "checks" is a global, but it's just a dummy in
> this case and not used.
>
> "global checks" as a statement doesn't "turn on" global assignment
> checking? Global assignment checking would be always on? Or is this
> simply how it works at the file chunk level? (Perhaps a new thread
> discussing the new change is warranted like the earlier "a new
> proposal for environments" thread. It would be most helpful to have an
> authoritative description of the proposed design.)

When Roberto introduced this, he said that the checking wouldn't be
turned on until the keyword was used (or some other trigger happened).
I believe that's what is happening here.

- Jim