[ruby-core:96586] [Ruby master Bug#16467] Fetching a class variable with instance_eval fails with NameError

Issue #16467 has been reported by barrettkingram (Barrett Ingram).

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Bug #16467: Fetching a class variable with instance_eval fails with NameError
https://bugs.ruby-lang.org/issues/16467

* Author: barrettkingram (Barrett Ingram)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Trying to fetch a class variable using `instance_eval` fails with `uninitialized class variable @variable_name in Object (NameError)`.

Reproduction program:
``` ruby
class FooClass
  def initialize
    @foo = "foo"
    @@bar = "bar"
  end

  def get_bar
    @@bar
  end
end

foo = FooClass.new
puts foo.instance_eval("@foo") # prints "foo"
puts foo.get_bar # prints "bar"
puts foo.instance_eval("@@bar") # raises uninitialized class variable @@bar in Object (NameError)
```



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