From: "shugo (Shugo Maeda)" <redmine@...>
Date: 2012-11-05T16:38:26+09:00
Subject: [ruby-core:48890] [ruby-trunk - Bug #7271] Refinement doesn't seem lexical


Issue #7271 has been updated by shugo (Shugo Maeda).


ko1 (Koichi Sasada) wrote:
> (2012/11/05 11:57), shugo (Shugo Maeda) wrote:
>  > Yes, it's intentional.  Refinements are activated when C_User is reopend.
>  > 
>  > I'm not sure whether is'a good idea or not, but if C_User.module_eval is affected by refinements, it seems natural reopened definitions of C_User are also affected.
>  
>  I can't understand that refinement is "lexical" or not.
>  
>  If it affected after re-open, then it is *not* "lexical".
>  If the location of `using' affect the result, then it seems "lexical".
>  ([ruby-core:48773] [ruby-trunk - Bug #7269])

I may have confused you by the word lexical, but I used the word lexical in the sense that refinements have no local rebinding.  I'm not sure whether refinements should be literally lexical or not.

I guess if refinements are literally lexical it's good for performance, but how module_eval (or an alternative to apply refinements to a given block) should behave?

----------------------------------------
Bug #7271: Refinement doesn't seem lexical
https://bugs.ruby-lang.org/issues/7271#change-32382

Author: ko1 (Koichi Sasada)
Status: Assigned
Priority: Normal
Assignee: shugo (Shugo Maeda)
Category: core
Target version: 2.0.0
ruby -v: ruby 2.0.0dev (2012-11-01 trunk 37404) [i386-mswin32_100]


C_User#y is refined.  Is that intentional?

class C
  def foo
    p :C_foo
  end
end
 
module RefineC
  refine C do
    def foo
      p :RefineC_foo
      super
    end
  end
end
 
class C_User
  using RefineC
  def x
    C.new.foo
  end
end
 
class C_User
  def y
    C.new.foo
  end
end
 
C_User.new.x
C_User.new.y

#=>
:RefineC_foo
:C_foo
:RefineC_foo
:C_foo



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