[ruby-core:85142] [Ruby trunk Bug#14407] defined? still returning true for top-level constant when referenced with scope

Issue #14407 has been reported by grzuy (Gonzalo Rodriguez).

----------------------------------------
Bug #14407: defined? still returning true for top-level constant when referenced with scope
https://bugs.ruby-lang.org/issues/14407

* Author: grzuy (Gonzalo Rodriguez)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
~~~ ruby
class A
end

class B
end

if defined?(A::B)
  puts "defined"

  puts A::B
else
  puts "not defined"
end
~~~


When running this script with ruby 2.5.0 i get:

~~~
defined
Traceback (most recent call last):
test.rb:10:in `<main>': uninitialized constant A::B (NameError)
Did you mean?  B
~~~

while my expectation was that after the top-level constant lookup was removed from ruby 2.5, defined? would return false and i would actually get 

~~~
not defined
~~~

as output




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