Issue #8027 has been updated by Hanmac (Hans Mackowiak).


ah good to know, but not the best way.  What if i want that a Module is extendable but not includable? Then append_features may not what i want 
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Feature #8027: add the possibility to raise an exception in #included, #extended, #prepended, #inherited and break the calling feature
https://bugs.ruby-lang.org/issues/8027#change-37384

Author: Hanmac (Hans Mackowiak)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 


imo an exception in this hook methods should be possible to prevent the adding in the ancestor chain

module A
def self.included(mod)
raise "dont include me"
end
end


module E
include A
end
##>> RuntimeError: dont include me


E.ancestors #=>[E,A]
what i want:
E.ancestors #=>[E]



maybe other hook methods like method_defined should get an "prevent" option too

maybe for not breaking code we could add "before_included" where an exception could be raised


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