What's C's biggest mistake?

[Walter Bright]

Sean Kelly wrote:
> On seeing this title I was going to interject "using pointers to
> represent arrays!" but it seems you beat me to it.  This is
> definitely the biggest problem with C.

Also here: http://news.ycombinator.com/item?id=1014533

I find the responses to be very curious, particularly the "not in the 
spirit of C" ones. Then there are the ones who deny that this even is an 
actual problem in C code.

It reminds me of why I decided to work on D rather than keep pushing on 
those ropes.