Making alloca more safe

[Andrei Alexandrescu]

bearophile wrote:
> Andrei Alexandrescu:
> 
>> Can't be written. Try it.
> 
> Thank you for being gentle with me still :-)
> Almost every day I say something stupid in this newsgroup...
> 
> Bye,
> bearophile

Sorry, I was just lacking the time. I also tried to encapsulate alloca 
once. It becomes obvious once you sit down and try to write the code.

Andrei