Issue #15877 has been reported by danielwaterworth (Daniel Waterworth).

----------------------------------------
Bug #15877: Incorrect constant lookup result in method on cloned class
https://bugs.ruby-lang.org/issues/15877

* Author: danielwaterworth (Daniel Waterworth)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.3
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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This behavior seems wrong to me:

``` ruby
class Foo
  def test
    TEST
  end
end

Bar1 = Foo.clone
Bar2 = Foo.clone

class Bar1
  TEST = 'bar-1'
end

class Bar2
  TEST = 'bar-2'
end

# If these two lines are reordered, 'bar-2' is produced each time
p [:bar1_method, Bar1.new.test] # outputs 'bar-1' (correct)
p [:bar2_method, Bar2.new.test] # outputs 'bar-1' (incorrect)

p [:bar1_const, Bar1::TEST] # outputs 'bar-1' (correct)
p [:bar2_const, Bar2::TEST] # outputs 'bar-2' (correct)
```

Possibly related to #9603



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