Conditional compilation inside asm and enum declarations

[Walter Bright]

Bill Baxter wrote:
> But from where I sit it looked like Walter didn't really convince
> anyone.  To me this seems like a point where D is overly patronizing,
> to use the phrase from a recent post.

You could argue that, but it also took a long time to convince many 
about the merit of const and immutable. I understand that C style 
versioning is so seductive, it's very hard to see what's wrong with it.

(For another reason against such, I could send you some of the source to 
optlink. It's chock full of line by line versioning, nested versioning, 
a couple dozen version arguments, it's so bad the only way I can tell 
what's going on is to compile it then *disassemble* it to see what the 
code actually is.)

Contrast that with the dmd front end source where I've made a concerted 
effort (not 100% yet) to remove #ifdef's.

And I didn't even touch on what would have to happen if versioning could 
slice anywhere - it would have to be done as a separate pre-pass. It 
couldn't be integrated in to the current one-pass parser, and would do a 
fine job of screwing up syntax highlighters and pretty-printers much 
like C's preprocessor can.