Bug #13973: super_method fails on some UnboundMethods

• Status: Closed
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: 2.5
• ruby -v: trunk
• Backport: 2.3: REQUIRED, 2.4: DONE

[marcandre (Marc-Andre Lafortune)]

super_method fails to go up the ancestry chain for methods that are only defined in included modules:

module A
  def foo
  end
end

module B
  def foo
  end
end

class C
  include A
  include B
end

class D
  def foo
  end
  include A
  include B
end

C.instance_method(:foo) # => #<UnboundMethod: C(B)#foo> (ok)
C.instance_method(:foo).super_method # => nil (wrong, should be <UnboundMethod: <something>(A)#foo>)
C.new.method(:foo).super_method # => #<Method: Object(A)#foo> (ok)
D.instance_method(:foo).super_method # => #<UnboundMethod: Object(B)#foo> (ok)
D.instance_method(:foo).super_method.super_method # => #<UnboundMethod: Object(A)#foo> (ok)

Note that the results for C and D's super_method differ slightly, with one outputing "C(B)" and the other "Object(B)". I don't understand why "Object" shows anywhere in my example. I would have expected the output to be "D(B)" in the later case. Should I open a different issue for this?

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r60127.

---

proc.c: super_method of included method

• proc.c (method_super_method): search the next super method along
  the included ancestor chain. [ruby-core:83114] [Bug #13973]

• vm_method.c (rb_callable_method_entry_without_refinements):
  return the defined class.

[nagachika (Tomoyuki Chikanaga)]

• Related to Bug #14421: super_method segfaults when called on a re-bound Method added

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN to 2.3: REQUIRED, 2.4: REQUIRED

I have noticed this ticket during searching changesets related with r62115.
I think r60127 should be backported, but you should backport r62115 too. See #14421.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: REQUIRED, 2.4: REQUIRED to 2.3: REQUIRED, 2.4: DONE

ruby_2_4 r62865 merged revision(s) 58245,60127.

[wanabe (_ wanabe)]

• Related to Bug #15629: super_method fails on binded/unbinded/cloned methods added