[ruby-core:68716] [Ruby trunk - Bug #10901] Object#singleton_methods behaves differently depending on whether the singleton_class exists

Issue #10901 has been updated by bug hit.


Is this a bug, and if not, why?

----------------------------------------
Bug #10901: Object#singleton_methods behaves differently depending on whether the singleton_class exists
https://bugs.ruby-lang.org/issues/10901#change-52000

* Author: bug hit
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
```ruby
class Class1
  def self.foo
  end
end
c1 = Class1.new
instance_eigen = c1.singleton_class
p instance_eigen.singleton_methods(false)
instance_eigen.singleton_class
p instance_eigen.singleton_methods(false)
```

before the eigen exists, singleton_methods returns the methods on the superclass of the non existent eigen
after it's created singleton_methods returns []

The existence or non-existence of the eigen is an implementation detail that should not be exposed to the user, conceptually it always exists.  So singleton_methods should treat a non existent eigen as an empty eigen, and not look to its superclass



-- 
https://bugs.ruby-lang.org/