[ruby-core:122241] [Ruby Bug#21364] Constant lookup in namespaces should be consistent

Issue #21364 has been reported by tenderlovemaking (Aaron Patterson).

----------------------------------------
Bug #21364: Constant lookup in namespaces should be consistent
https://bugs.ruby-lang.org/issues/21364

* 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
----------------------------------------
This might be related to #21363, but I'm not sure.

I expect that a top level `Bar` constant should have the same value as `Object::Bar`.  For example:

```ruby
File.binwrite("ns.rb", <<-RUBY)
# namespace 3
Bar = 123

module M
  def self.test
    p Bar: Bar
    p "Object::Bar": Object::Bar
  end

  TEST = -> {
    p Bar: Bar
    p "Object::Bar": Object::Bar
  }
end
RUBY

Bar = 456

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

ns::M.test
ns::M::TEST.call
```

The output is this:

```
RUBY_NAMESPACE=1 ./miniruby test.rb
./miniruby: warning: Namespace is experimental, and the behavior may change in the future!
See doc/namespace.md for known issues, etc.
{Bar: 123}
{"Object::Bar": 123}
{Bar: 123}
{"Object::Bar": 456}
```

But I expected this:

```
{Bar: 123}
{"Object::Bar": 123}
{Bar: 123}
{"Object::Bar": 123}
```

Constant lookups in methods seem to behave differently than in lambdas.



-- 
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