From: Nikolai Weibull <now@...>
Date: 2011-12-23T16:01:14+09:00
Subject: [ruby-core:41789] Re: Breaking while loading

On Fri, Dec 23, 2011 at 07:17, Satoshi Shiba <shiba@rvm.jp> wrote:

> I can't judge whether this is a bug for Ruby runtime or not.
> However, I can show reasons why LocalJumpError has occurred.
>
> Reasons why LocalJumpError has occurred are consisting of followings.
>
> 1:"break" in proc objects cause LocalJumpError.
> 2:In your example, $block in A#enum is a proc object
> ��and $block in A#enum causes "break".

It���s not quite that simple.  If you move contents of b.rb to a method
b in a.rb and call it instead of loading b.rb everything works as
expected.  It seems like the break can���t cross load.

You can work around this limitation/bug by postponing execution of the
contents of b.rb until after load has returned, but I still want to
know if this is a bug or not.

a.rb:
def back_to_a(&block)
  $a = block
end

class A
  include Enumerable

  def each(&block)
    $block = block
    load 'b.rb', true
    $a.call
    self
  end
end

p A.new.take_while{ |i| i < 3 }

b.rb:
back_to_a do
  $block.call 1
  $block.call 2
  $block.call 3
end