[ruby-core:78906] [Ruby trunk Bug#13087] Regression of instance_exec behaviour in ruby 2.4

Issue #13087 has been updated by Tiago Cardoso.

ruby -v set to ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux] 

----------------------------------------
Bug #13087: Regression of instance_exec behaviour in ruby 2.4
https://bugs.ruby-lang.org/issues/13087#change-62317

* Author: Tiago Cardoso
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux] 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
I've just caught up this running our test suite against the newly released ruby 2.4. Here is the repro gist:

```ruby

class A                                    
  def initialize(x)                        
    @x = x                                 
  end                                      
  def perform                              
    puts "performing #{@x} times"          
  end                                      
end                                        
                                           
                                           
puts "basic"                               
A.new(1).tap do |a|                        
  a.instance_exec do                       
    perform                                
  end                                      
end                                        
                                           
#puts "advanced"                           
A.new(1).tap do |a|                        
  a.instance_exec(A.new(3), &:perform)     
end                                        
                                           
```

The last one output "3 times in all ruby 2's except latest 2.4 . 

This seems to apply the to_proc symbol to the object itself, and not the argument of instance_exec, which is a regression. 




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