Forum: Ruby-core [Open] descendants of a module don't gain its future ancestors, but descendants of a class, do

88144e3f7b9d7e3435a41492887b3999?d=identicon&s=25 Mean Login (mean_l)
on 2014-02-27 07:05
(Received via mailing list)
Issue #9573 has been reported by First Last.

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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

* Author: First Last
* Status: Open
* Priority: Normal
* Assignee:
* Category:
* Target version:
* ruby -v: ruby 2.1.1p76 (2014-02-24 revision 45161) [i686-linux]
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN
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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]
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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
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