[ruby-core:122240] [Ruby Bug#21363] `Namespace.current` should always return the Namespace in which it was defined

Issue #21363 has been reported by tenderlovemaking (Aaron Patterson).

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Bug #21363: `Namespace.current` should always return the Namespace in which it was defined
https://bugs.ruby-lang.org/issues/21363

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* ruby -v: ruby 3.5.0dev (2025-05-22T23:07:21Z rm-assertion 17e71c7a24) +PRISM [arm64-darwin24]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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I think `Namespace.current` should always return the namespace in which it was defined.  Here is an example to demonstrate what I mean:

```ruby
File.binwrite("ns.rb", <<-RUBY)
# namespace 3

module M
  def self.test
    p Namespace.current
  end

  TEST = -> {
    p Namespace.current
  }
end
RUBY

ns = Namespace.new
ns.load "./ns.rb"

p Namespace.current
ns::M.test
ns::M::TEST.call
```

I expect the output of `ns::M.test` and `ns::M::TEST.call` to be the same.  Instead the output is like this:

```
#<Namespace:2,user,main>
#<Namespace:3,user,optional>
#<Namespace:2,user,main>
```

I think a method and lambda defined in the same namespace should return the same value for `Namespace.current`



-- 
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