From: Mike Gold <mike.gold.4433@...>
Date: 2008-10-01T00:02:37+09:00
Subject: Re: ruby1.9 block scope

Daniel DeLorme wrote:
> David A. Black wrote:
>> before you could begin to understand any of it. And you would have to
>> do that for *every* block, just in case, even if only 1% of them had a
>> variable defined later.
> 
> You dont need a two-pass visual scan; it just allows you to assume that
> a variable defined a line L of a method will be available for reference
> at line L+n, no matter if it was defined inside a block or not. It
> should be common sense, really.

You have described exactly what D. Black and I mean by a two-pass scan. 
Line L is dependent on code arbitrarily far ahead at L+n.

When you encounter the variable at line L+n, you should backtrack to 
line L to determine whether or not the block scopes are aligned in such 
a way to change the meaning of line L.
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