[ruby-dev:49979] [Ruby trunk Bug#13204] Search order of constant is different

Issue #13204 has been reported by okkez _.

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Bug #13204: Search order of constant is different
https://bugs.ruby-lang.org/issues/13204

* Author: okkez _
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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```ruby
class CleanRoom < BasicObject
  def call
    instance_eval(<<-CODE)
    $stdout.puts ::ENV.size
    CODE
  end

  def call2
    instance_eval(<<-CODE)
    $stdout.puts ENV.size
    CODE
  end

  def call3
    instance_eval { $stdout.puts ::ENV.size }
  end
end

class CleanRoom2
  def call
    instance_eval(<<-CODE)
    $stdout.puts ENV.size
    CODE
  end
end

CleanRoom.new.call # => 80 (in my environment)
CleanRoom2.new.call # => 80
CleanRoom.new.call3 # => 80
CleanRoom.new.call2 # => t.rb:14:in `instance_eval': uninitialized constant #<Class:#<CleanRoom:0x0055698d201da8>>::ENV (NameError)
```

`CleanRoom` instance cannot refer constants defined in top level.
Is this intentional?




-- 
https://bugs.ruby-lang.org/