[ruby-core:93791] [Ruby master Bug#4484] Class variables leak to Object when using class_eval

Issue #4484 has been updated by jeremyevans0 (Jeremy Evans).

Backport set to 2.5: UNKNOWN, 2.6: UNKNOWN
Status changed from Open to Rejected
Description updated
Project changed from Ruby 1.8 to Ruby master

This is still true in master, but I believe this is expected behavior/spec.  This is similar to constants:

```ruby
String.class_eval {A = 1}
Object::A
# => 1
```

If you want to scope constants or class variables, you need to reopen the class using `class` syntax:

```ruby
class String
  @@string_class_variable = 'should be only in String'
  A = 1
end
Object.class_variables.include? :@@string_class_variable
# => false
Object::A
# NameError (uninitialized constant A)
```

----------------------------------------
Bug #4484: Class variables leak to Object when using class_eval
https://bugs.ruby-lang.org/issues/4484#change-79540

* Author: pawel (Paweł P)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
=begin
The following irb session describes the problem:

 >> String.class_eval { @@string_class_variable = 'should be only in String' }
 => "should be only in String"
 >> "WTF?" if Object.class_variables.include? "@@string_class_variable"
 => "WTF?"

Tested on 1.8 and 1.9.
I've created the issue in "ruby-18" project because "ruby" project doesn't allow to create new issues.
=end




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