[ruby-core:86435] [Ruby trunk Bug#14658] Kernel#singleton_method is incompatible with Module#prepend.

Issue #14658 has been reported by nashby (Vasiliy Ermolovich).

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Bug #14658: Kernel#singleton_method is incompatible with Module#prepend.
https://bugs.ruby-lang.org/issues/14658

* Author: nashby (Vasiliy Ermolovich)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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It's not possible to get singleton method using Kernel#singleton_method if singleton class was prepended with any module:

~~~ ruby
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. 




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