[ruby-core:75182] [Ruby trunk Feature#12317] Name space of a module

Issue #12317 has been reported by Tsuyoshi Sawada.

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Feature #12317: Name space of a module
https://bugs.ruby-lang.org/issues/12317

* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee: 
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I want a method to return the  name space of a module, something like:

~~~ruby
class A; module B; module C end end end

A::B::C.namespace => [A, A::B, A::B::C]
~~~

There is `nesting` method that is similar, but that only returns the lexical nesting information.

There are also some known hacks for this, converting the module to the string representation using `to_s` or `name`, and then splitting it by `::`. But that easily breaks if the module is anonymous, or is a singleton module. I would like a more robust, core method.



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