Re: upcoming changes in Lua 5.2 [was Re: Location of a package]

[Diego Nehab <diego@...>]

Hi,

> FYI, I've just been converting some tracking loop code to do the following:
>
>    repeat
>
>        local event = getNextMouseEvent()
>
>        local done = event.what == "mouseUp"
>
>        -- do the tracking work
>
>    until done
>
> So, obviously I would then be burned by a change that switched the scope of
> the conditional. (Okay. Our linter would detect the access to the global
> variable "done" and complain.)

I believe this type of code is what motivated the change,
and it seemed very reasonable at the time, mostly because
the language does not and did not support "continue". Had
the language supported "continue" from the start, the
problem with the change would have been obvious. I was a big
advocate for the change, and it never crossed my mind it
would ever be an issue. Even now, I still prefer the new
scope rule. There is a thread about this from 2005, when
somebody created a "continue" patch.

Regards,
Diego