Bug #9626: alias, prepend and super cause unexpected SystemStackError

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN

[eagletmt (Kohei Suzuki)]

module M
  def foo
    super
  end
end

class C
  def foo
    'C#foo'
  end

  prepend M
  alias_method :orig_foo, :foo
  def foo
    orig_foo
  end
end

C.new.foo

I expect: M#foo -> C#foo -> C#orig_foo and get 'C#foo'
Actual: M#foo -> C#foo -> M#foo -> ... and get stack level too deep (SystemStackError)
If I swap the order of alias_method and prepend, it works as I expect.

I think it's closely related to #7842.

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Rejected

It differs from #7842, since you overwrites C#foo itself.
C#orig_foo is an alias of M#foo, but not of the former C#foo.