From: "matz (Yukihiro Matsumoto) via ruby-core" <ruby-core@...>
Date: 2022-12-23T02:37:14+00:00
Subject: [ruby-core:111388] [Ruby master Bug#11064] #singleton_methods for objects with special singleton_class returns an empty array

Issue #11064 has been updated by matz (Yukihiro Matsumoto).


@sawa Singleton classes are in principle only accessed using the `singleton_class` method or the singleton class notation. Implementation wise, FL_SINGLETON is set for singleton classes. Neither is true for NilClass (nor FalseClass nor TrueClass).

Matz.

----------------------------------------
Bug #11064: #singleton_methods for objects with special singleton_class returns an empty array
https://bugs.ruby-lang.org/issues/11064#change-100763

* Author: rbjl (Jan Lelis)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
~~~
def nil.bla
  42  
end

# works
nil.bla #=> 42
nil.singleton_method(:bla) #=> #<Method: NilClass#bla>
NilClass.instance_methods.include? :bla #=> true

# does not work
nil.singleton_methods #=> []
~~~




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