[ruby-core:64862] [CommonRuby - Feature #10216] [Open] Add methods to Method and UnboundMethod classess to retrieve method instance for super

Issue #10216 has been reported by RadosナＢw BuナＢt.

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Feature #10216: Add methods to Method and UnboundMethod classess to retrieve method instance for super
https://bugs.ruby-lang.org/issues/10216

* Author: RadosナＢw BuナＢt
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Category: 
* Target version: 
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Because of ruby dynamism nature it is very usefull to check method source location directly in irb/pry by SomeClass.instance_method(:foo).source_location. Very often checked method will call super method and we also want to check this method. And this quite hard to find because super method can be defined in any included class or in parent class. Here is my proposal: add super_method to Method and UnboundMethod classes. This method should return corresponding Method or UnboundMethod instance representing next method in super chain list (or nil if there is no one).

For example:

```ruby
module A
  def foo
    puts "from A"
  end
end

class X
  include A

  def foo
    puts "from X"
    super
  end
end
```

```irb
> foo_method = X.instance_method(:foo)
#<UnboundMethod: X#foo>
> foo_method.source_location
["/private/tmp/t/feature.rb", 10]
> foo_method.bind(X.new).call
from X
from A
nil

> # this is feature proposal
> super_foo_method = foo_method.super_method
> #<UnboundMethod: X(A)#foo>
> super_foo_method.source_location
["/private/tmp/t/feature.rb", 2]
> super_foo_method.bind(X.new).call
from A
nil

> super_method_foo.super_method
nil
```



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