[ruby-core:103057] [Ruby master Feature#17753] Add Module#outer_scope

Issue #17753 has been updated by Eregon (Benoit Daloze).


@sawa I'd say first assignment to a named constant wins, just like for Module#name.

I agree with the feature.
I'd suggest `Module#namespace` for the name though.
For example, I'd say the namespace of `Process::Status` is `Process`.

`scope` feels general to me, and there are many other scopes, so I think namespace is a more precise term for it.

`namespace` is also the term used in https://github.com/ruby/ruby/blob/master/doc/syntax/modules_and_classes.rdoc#label-Modules

----------------------------------------
Feature #17753: Add Module#outer_scope
https://bugs.ruby-lang.org/issues/17753#change-91118

* 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)


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