Issue #12131 has been updated by jeremyevans0 (Jeremy Evans).


Given that `singleton_method_added` is called after the method is added and not before, I think the current behavior makes sense and do not think it is the bug.  The same behavior exists for `method_added`:

```ruby
module A
  extend self
  def method_added(n) p n end
end
```

outputs:

```
:method_added
```

----------------------------------------
Bug #12131: Should defining singleton_method_added call itself?
https://bugs.ruby-lang.org/issues/12131#change-78925

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
This seems surprising:

~~~
obj = Object.new
def obj.singleton_method_added(n)
  p n
end
def obj.new_singleton_method; end
~~~

outputs

~~~
:singleton_method_added
:new_singleton_method
~~~



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