Re: a new proposal for environments

[David Kastrup <dak@...>]

Roberto Ierusalimschy <roberto@inf.puc-rio.br> writes:

>> On Thu, Feb 25, 2010 at 4:13 PM, steve donovan
>> <steve.j.donovan@gmail.com> wrote:
>> > Using _G specially refers to the global namespace; _ENV may or may not.
>> Using _G refers to _ENV._G, hence if you've changed _ENV, then _G
>> refers to the global namespace if and only if you added a _G field to
>> the custom _ENV pointing back to the original value of _ENV. If you
>> haven't changed _ENV, then _G and _ENV are the same thing anyway.
>
> Keep in mind that it is common to have the new environment inheriting
> from the original one (e.g., the option 'seeall' in 'module'). In those
> cases, _G is automatically accessible in the new environment, and
> it is different from _ENV.

Up to now, the difference is quite too much in the "eyes glaze over"
department for my taste.

-- 
David Kastrup