From: Jim Freeze <jimfreeze@...>
Date: 2006-02-27T03:33:44+09:00
Subject: Re: Scope of constants in instance_eval

On Feb 26, 2006, at 12:08 PM, Phrogz wrote:

> Jim Freeze wrote:
>> Hmm, that could be a bug in ruby because
>>
>>     p BAR
>>
>> works.
>
> Hrm? Not on my machine.

Hmm, even more interesting. Change the following:

>
> class Foo
> 	BAR = 1
> 	def initialize( &block )
           def initialize(str)
> 		instance_eval &block
                   instance_eval str
> 	end
> 	def bork
> 		puts "bork: self is #{self}"
> 		puts "bork: BAR is #{BAR}!"
> 	end
> end
>
> Foo.new{
   Foo.new %Q{
> 	bork
> 	puts "block: self is #{self}"
> 	#puts "block: BAR is #{BAR}!"
> 	p BAR
> }
>

Now what do you get?

> #=> bork: self is #<Foo:0x32af44>
> #=> bork: BAR is 1!
> #=> block: self is #<Foo:0x32af44>
> #=> NameError: uninitialized constant BAR
>
>

Jim Freeze