Making alloca more safe

[Walter Bright]

bearophile wrote:
> They use a different design strategy to
> be so reliable.

My understanding (I am no biologist) is that biology achieves 
reliability by using redundancy, not by requiring individual components 
to be perfect.

The redundancy goes down to the DNA level, even.

Another way is it uses quantity, rather than quality. Many organisms 
produce millions of offspring in the hope that one or two survive.

Software, on the other hand, is notorious for one bit being wrong out of 
a billion rendering it completely useless. A strategy of independent 
redundancy is appropriate here.

For example, how would you write a program that would be expected to 
survive having a random bit in it flipped at random intervals?