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Bug #11301
closedModule#prepend should have always added the module before the current
Description
I don't think it's ideal:
module M
end
class A
prepend M
end
A.ancestors
# => [M, A, Object, PP::ObjectMixin, Kernel, BasicObject]
class B<A
prepend M
end
B.ancestors
# => [B, M, A, Object, PP::ObjectMixin, Kernel, BasicObject]
It should be either error (for not adding module) or the module appearing multiple times,
i.e. B.ancestors
to be
[M, B, M, A, Object, PP::ObjectMixin, Kernel, BasicObject]
Matz.
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