[ruby-core:120213] [Ruby master Bug#20948] Constant references incorrectly cached in `module (expr)::Foo`

Issue #20948 has been reported by mame (Yusuke Endoh).

----------------------------------------
Bug #20948: Constant references incorrectly cached in `module (expr)::Foo`
https://bugs.ruby-lang.org/issues/20948

* Author: mame (Yusuke Endoh)
* Status: Assigned
* Assignee: ko1 (Koichi Sasada)
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
```ruby
module M1
  module Foo
    X = 1
  end
end

module M2
  module Foo
    X = 2
  end
end

[M1, M2].each do
  module it::Foo
    p X #=> expected: prints "1" then "2"; actual: prints "1" twice
  end
end
````

To be honest, I don't think it's worth slowing down the processor for this, but I create a ticket since I discovered it and since ko1 seemed to have a bit of an idea of how to solve it.



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