[ruby-core:97288] [Ruby master Bug#9573] descendants of a module don't gain its future ancestors, but descendants of a class, do

Issue #9573 has been updated by matz (Yukihiro Matsumoto).


The patch for `include` looks OK to me. To ensure there are no unseen compatibility issues, I'd like to experiment with it during the 2.8 development cycle. I am not yet sure how `prepend` should work here. I need to think about it more deeply. Keep it as it is for `prepend` for the moment.

Matz.


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Bug #9573: descendants of a module don't gain its future ancestors, but descendants of a class, do
https://bugs.ruby-lang.org/issues/9573#change-84406

* Author: rits (First Last)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.1.1p76 (2014-02-24 revision 45161) [i686-linux]
----------------------------------------
```ruby
module Mod1
end

module Mod2
end

class Class1
end

class Class2 < Class1
end

p Class2.ancestors - Object.ancestors # [Class2, Class1]

Class1.include Mod1

p Class2.ancestors - Object.ancestors # [Class2, Class1, Mod1]

Mod1.include Mod2

p Mod1.ancestors - Object.ancestors # [Mod1, Mod2]

p Class2.ancestors - Object.ancestors # [Class2, Class1, Mod1]
```
________________________________________________________________

note that descendants of a class do gain its future ancestors

so 2 issues:

1. It would seem natural that in dynamic language, dynamically added ancestors should propagate to descendants
2. Why is there a difference in ancestor propagation between modules and classes
 

---Files--------------------------------
include-future-ancestors-9573.patch (3.49 KB)
prepend-future-ancestors-9573.patch (6.42 KB)


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