[ruby-core:81403] [Ruby trunk Feature#13601] Remove yield_self from Ruby 2.5 (already implemented)

Issue #13601 has been updated by zverok (Victor Shepelev).


`instance_eval` changes scope, while `yield_self` does not.

```ruby
class A
  def foo
    1
  end

  def yield_self
    yield self
  end
end

def self.foo
  2
end

p A.new.instance_eval { self.foo * 3 } # => 3
p A.new.yield_self { self.foo * 3 } # => 6
```

An example is synthetic, yet the difference is important.
...and was discussed multiple times on the road to `yield_self`, to be honest.

----------------------------------------
Feature #13601: Remove yield_self from Ruby 2.5 (already implemented)
https://bugs.ruby-lang.org/issues/13601#change-65112

* Author: danielpclark (Daniel P. Clark)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Issue https://bugs.ruby-lang.org/issues/6721 for adding `yield_self` is unnecessary as `BasicObject#instance_eval` will do the exact same thing.

~~~ruby
class BasicObject
  alias :yield_self :instance_eval
end

2.yield_self { |x| x*x } # => 4
~~~

I've tried all the examples of its given use cases and `BasicObject#instance_eval` will do them all.

In issue #6721 nobu said he didn't like the name `yield_self`.  I'm in agreement about the name.  Since `BasicObject#instance_eval` will already pipe in `self` and return the value of the block `yield_self` is not necessary.



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