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

[Frank Meier-Dörnberg <frank@...>]

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