[antlr-interest] syn pred implementation

[Terence Parr]

Heh great ideas everybody!

I will definitely explore this option.  I like having a single style of 
code gen that will work on all algol derivatives so exception-based 
implementations ain't so good.  I just have to look at it some more.

 From a grammar user perspective, however, I think exceptions for errors 
is a major leap over other stuff.  Perhaps we can just make it look 
like you have exceptions but under the hood it's a bunch of IFs and 
such.

I wonder what LISP and ML will do.  Hmm...

Oh, the old C-code generator for PCCTS used longjmp for predicates ;)

Ter
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