Re: [ANN] Lua 5.2.0 (beta-rc1) now available

[Eduardo Ochs <eduardoochs@...>]

On Wed, Jun 15, 2011 at 12:59 PM, Frank Meier-Dörnberg <frank@md-web.de> wrote:
> On 15.06.2011 16:22, David Kastrup wrote:
>>
>> Frank Meier-Dörnberg<frank@md-web.de>  writes:
>>
>>> On 13.06.2011 22:27, Alexandre Erwin Ittner wrote:
>>>>
>>>> [...]
>>>> A "label" keyword would be great too, but it will break so much code.
>>>>
>>>> [...]
>>>
>>> Yesterday Xavier Wang brought to mind an alternative.
>>> I'm missing a reaction to that:
>>>
>>> "maybe using a local variable scope for goto destination is better
>>> than define a (whatever) label statement."
>>>
>>> In my words: Use "local mark" instead of "label mark" or "@mark:"
>>> I must admit that I have not thought about whether that is
>>> semantically clever.
>>> What are thepros and cons?
>>
>> How would that work with jumping forward?
>>
>> local mark
>> goto mark
>> local mark
>>
>
> I must admit that....  :-)
> OK, maybe I've missed the whole discussion.
> a) Is this problem avoided by "label mark"?
>   (=>  Is repeating a label in the same scope considered as an error?)
> b) Is the following rule a bad idea?: "goto mark" jumps to the first
> definition reachable in scope.
>   (=>  Do not use backward definitions, if you want to jump forward)
>
> --Frank

What about this syntax?
  local :mark:
  goto mark

Cheers,
  Eduardo Ochs
  eduardoochs@gmail.com
  http://angg.twu.net/queremos.html