[ruby-core:74274] [Ruby trunk Bug#12164] Binding UnboundMethod to BasicObject

Issue #12164 has been updated by Nobuyoshi Nakada.


"Yes" was to
> Probably it is somehow related to https://bugs.ruby-lang.org/issues/11278

I guess it's a bug-fix, but maybe an improvement.
Subtle.

----------------------------------------
Bug #12164: Binding UnboundMethod to BasicObject
https://bugs.ruby-lang.org/issues/12164#change-57400

* Author: Nikita Shilnikov
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
I tried to bind method from Object to BasicObject and I suddenly succeeded. 
For example:

```
$ irb
2.3.0 :001 > BasicObject.send :define_method, :methods, Object.instance_method(:methods)
 => :methods
2.3.0 :002 > BasicObject.new.methods
 => [:!, :==, :!=, :__send__, :equal?, :methods, :instance_eval, :instance_exec, :__id__]
2.3.0 :003 >
```

In earlier ruby versions such code would raise an exception:

```
$ irb
2.2.4 :001 > BasicObject.send :define_method, :methods, Object.instance_method(:methods)
TypeError: bind argument must be a subclass of Object
	from (irb):1:in `define_method'
	from (irb):1
	from /Users/gordon/.rvm/rubies/ruby-2.2.4/bin/irb:11:in `<main>'
2.2.4 :002 >
```

Is it a bug or a feature?
Probably it is somehow related to https://bugs.ruby-lang.org/issues/11278



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