Wouldn't it be best if Module#ancestors returned the modules & classes in the order they will be looked at?
Currently:
module M; end
class C; prepend M; end
C.ancestors # => [C, M, Class, Object, Kernel, BasicObject]
# even though actual lookup order is [M, C, Class, Object, Kernel, BasicObject]
This issue was solved with changeset r36241.
Marc-Andre, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.
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