From: "ko1 (Koichi Sasada)" <noreply@...>
Date: 2022-12-06T09:13:04+00:00
Subject: [ruby-core:111219] [Ruby master Feature#18798] `UnboundMethod#==` with inherited classes

Issue #18798 has been updated by ko1 (Koichi Sasada).

Status changed from Open to Closed

https://github.com/ruby/ruby/pull/6855 was merged.

`p String.instance_method(:object_id) == Array.instance_method(:object_id) #=> true`


----------------------------------------
Feature #18798: `UnboundMethod#==` with inherited classes
https://bugs.ruby-lang.org/issues/18798#change-100509

* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
----------------------------------------
Now `UnboundMethod` for a same method from a superclass and an inherited class are not `==`.

```ruby
class C
  def foo = :C
  $mc = instance_method(:foo)
end

class D < C
  $md = instance_method(:foo)
end

p $mc == $md #=> false
p $mc.owner #=> C
p $mc.owner == $md.owner #=> true
p $mc.source_location == $md.source_location #=> true
p $mc.inspect #=> "#<UnboundMethod: C#foo() t.rb:3>"
p $md.inspect #=> "#<UnboundMethod: D(C)#foo() t.rb:3>"
```

How about to make it `UnboundMethod#==` return true for this case?
Rule: "return true if the UnboundMethod objects point to a same method definition" seems simple.

FYI: On aliased unbound methods point to a same method are `==`.


```ruby
class C
  def foo = :C
  alias bar foo
  $mfoo = instance_method(:foo)
  $mbar = instance_method(:bar)
end

p $mfoo, $mbar
#=> #<UnboundMethod: C#foo() t.rb:2>
#=> #<UnboundMethod: C#bar(foo)() t.rb:2>

p $mfoo == $mbar #=> true
```




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