[ruby-core:112285] [Ruby master Feature#17753] Add Module#namespace

Issue #17753 has been updated by fxn (Xavier Noria).


Let me reword that last remark about "the Ruby model suffers just a little bit".

Ruby objects and variables behave the same. But constants are not as orthogonal and generic:

1. When you assign an integer to a constant, it's just storage. If you assign a class or module object with a name, it's just storage. However, assigning an anonymous class or module object changes the state, it has a side-effect that is only programmed for these objects.
2. The `class` and `module` keywords perform constant assignments.

So, "suffer" is not an exact word for what I have in mind. I'd say this change would accentuate an already existing asimmetry, and in a way that is consitent with `Module#name`. This is not bad, it goes in a consistent direction.

----------------------------------------
Feature #17753: Add Module#namespace
https://bugs.ruby-lang.org/issues/17753#change-101717

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
Given code like this:

```ruby
module A
  module B
    class C; end
    class D; end
  end
end
```

We can get from `C` to `B` like `C.outer_scope`, or to `A` like
`C.outer_scope.outer_scope`.

I want to use this in cases where I don't know the outer scope, but I
want to find constants that are "siblings" of a constant.  For example,
I can do `A::B::C.outer_scope.constants` to find the list of "sibling"
constants to `C`.  I want to use this feature when walking objects and
introspecting.  For example:

```ruby
ObjectSpace.each_object(Class) do |k|
  p siblings: k.outer_scope.constants
end
```

I've attached a patch that implements this feature, and there is a pull request on GitHub [here](https://github.com/ruby/ruby/pull/4326).

---Files--------------------------------
0001-Add-Module-outer_scope.patch (5.93 KB)
0001-Add-Module-namespace.patch (5.89 KB)


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