From: matz@...
Date: 2020-10-26T04:29:20+00:00
Subject: [ruby-core:100547] [Ruby master Bug#14012] NameError is raised when use class variables in Refinements

Issue #14012 has been updated by matz (Yukihiro Matsumoto).

Status changed from Open to Rejected

I officially reject this proposal. Class variables are no longer encouraged to use.

Matz.


----------------------------------------
Bug #14012: NameError is raised when use class variables in Refinements
https://bugs.ruby-lang.org/issues/14012#change-88174

* Author: joker1007 (Tomohiro Hashidate)
* Status: Rejected
* Priority: Normal
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Sorry in advance if other ticket exists. 

In a case, Reference to class variables raises unnatural NameError.

A class variable is defined in a module.
And include the module in "refine" block.
Refined method cannot use the class variable, and raises NameError.

Sample.

~~~ ruby
module FooMod
  @@foo_mod1 = 1

  def foo_mod1
    p self.class.class_variable_get("@@foo_mod1")
  end
end

module FooMod2
  @@foo_mod2 = 1

  def foo_mod2
    p self.class.class_variable_get("@@foo_mod2")
  end
end

class Foo
  @@hoge = 1

  include FooMod

  def hoge1
    p @@hoge
  end
end

module Ext
  refine Foo do
    def hoge2
      p self.class.class_variable_get("@@hoge")
    end

    include FooMod2
  end
end

using Ext

Foo.new.hoge1 # => 1 OK
Foo.new.hoge2 # => 1 OK

Foo.new.foo_mod1 # => 1 OK
Foo.new.foo_mod2 # => uninitialized class variable @@foo_mod2 in Foo (NameError)
~~~
 

Is This behavior Refinements spec? or bug?



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