From: nobuyoshi nakada <nobuyoshi.nakada@...>
Date: 2005-11-16T14:34:15+09:00
Subject: Re: The subtleties of const_missing

Hi,

At Wed, 16 Nov 2005 13:36:46 +0900,
Nicholas Seckar wrote in [ruby-talk:165996]:
> I've run into an issue regarding the use of const_missing. This issue  
> revolves around the fact that these two cases are supposed to behave  
> differently from each other:
> 
> irb(main):001:0> B = 10
> irb(main):002:0> module A; B; end
> => 10
> irb(main):003:0> A::B
> NameError: uninitialized constant A::B
>          from (irb):3
> 
> However it seems impossible to detect which case we are in within the  
> const_missing method. A more detailed explanation follows:

What about autoload?

  $ echo 'B = 10' > b.rb

  $ irb
  irb(main):001:0> autoload :B, "b"
  => nil
  irb(main):002:0> module A;end
  => nil
  irb(main):003:0> A::B
  NameError: uninitialized constant A::B
          from (irb):3
          from :0
  irb(main):004:0> module A;B;end
  => 10
  irb(main):005:0> A::B
  NameError: uninitialized constant A::B
          from (irb):5
          from :0
  irb(main):006:0>

-- 
Nobu Nakada