Re: [ANN] Lua 5.2.0 (beta-rc5) now available

[Roberto Ierusalimschy <roberto@...>]

> This way of removing functions might not be ideal:
> 
>   [...]
>   > setfenv(function()end, {})
>   stdin:1: deprecated function
>   stack traceback:
>   	[C]: in function 'setfenv'
>   	stdin:1: in main chunk
>   	[C]: in ?
> 
> The reason is that to test whether a function exists, it is not as simple as
> 
>   if io.popen then ..... end
> 
> [...]

On the other hand, I guess this message may be very useful for people
changing from 5.1 to 5.2. (Not people from the list, who has been
discussing the changes for a long time, but many (most?) programmers
not aware of all changes...)

-- Roberto