foreach ... else statement

[Walter Bright]

Sean Kelly wrote:
>> I keep thinking I should put on a "Compiler Construction" seminar!
> 
> You should.  The academic courses do a good job with theory and
> general application, but that isn't quite the same as one based on
> practical experience.

That's true. I learned the theory taking a compiler construction course 
at Standford, and then tried to apply it. It turns out that there's a 
lot they left out <g> that's needed to actually get those optimizations 
to work.

Loop induction variables was a big one, because the theory never takes 
into account the fact that you're replacing a signed loop index with an 
unsigned loop pointer. Oops!

It's like in physics class you're always dealing with frictionless 
brakes and pointless masses.