From: Brian Candler <B.Candler@...>
Date: 2003-05-31T00:39:48+09:00
Subject: Re: local variable and local variable in block behave differently

On Sat, May 31, 2003 at 12:32:28AM +0900, ahoward wrote:
> On Sat, 31 May 2003, ts wrote:
> 
> >  Well, it's more
> <snip>
> 
> i was *trying* to say that... ;-)
> 
> one thing i'm fuzy on though - ruby parses/runs in one pass

I don't think so - it parses and builds an AST in a single pass, then it
walks the AST after that. Certain types of syntax error break at the parsing
stage, so nothing gets run.

But note that the *parsing* of a class or method definition does not
actually create the class or method; it is only when it is run that the
class is created. At an extreme:

   print "Do you want debugging? "
   if gets =~ /\A[Yy]/
     class Foo
       .. debug version
     end
   else
     class Foo
       .. non-debug version
     end
   end

The class definitely isn't defined until run-time.

Regards,

Brian.