ruby-core

Issue #10901 has been reported by bug hit.

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

* 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
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```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



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