Bug #14658: Kernel#singleton_method is incompatible with Module#prepend.

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.5.0
• Backport: 2.3: UNKNOWN, 2.4: DONE, 2.5: DONE

[nashby (Vasiliy Ermolovich)]

It's not possible to get singleton method using Kernel#singleton_method if singleton class was prepended with any module:

module Empty; end

class MyClass
  singleton_class.prepend(Empty)

  def self.foo; end
end

MyClass.singleton_methods(false) # => [:foo]
MyClass.singleton_method(:foo) # => NameError (undefined singleton method `foo' for `MyClass')

Attached patch fixes it.

[nashby (Vasiliy Ermolovich)]

• File fix_singleton-method-prepend.patch fix_singleton-method-prepend.patch added

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r63067.

---

Fix Kernel#singleton_method with Module#Prepend

• proc.c (rb_obj_singleton_method): search the method entry from
  the origin class, for fix prepended modules. [Bug #14658]

From: Vasiliy Ermolovich [e-mail]

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN to 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: REQUIRED to 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: DONE

ruby_2_5 r64981 merged revision(s) 63067,63068.

[usa (Usaku NAKAMURA)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: DONE to 2.3: UNKNOWN, 2.4: DONE, 2.5: DONE

ruby_2_4 r65118 merged revision(s) 63067,63068.