Issue #13592 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN to 2.2: WONTFIX, 2.3: WONTFIX, 2.4: UNKNOWN

memo: I think this is a bug, but it may cause some compatibility problems to change the behavior in teeny release, then I decided not to backport this to ruby_2_3.

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Bug #13592: Enumerable#reduce with symbol does not respect method visibility
https://bugs.ruby-lang.org/issues/13592#change-65537

* Author: americodls (Americo Duarte)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin15]
* Backport: 2.2: WONTFIX, 2.3: WONTFIX, 2.4: UNKNOWN
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When use reduce with symbol, I expect the symbol is called in object but respecting the method visibility.

Example with source code written in a file.

~~~ruby
Fixnum.instance_eval do
  private :+
end

p [1,2,3].reduce(:+)
~~~

The behavior in IRB is different.

~~~
irb(main):001:0> [1,2,3].reduce(:+)
=> 6
irb(main):002:0> Fixnum.instance_eval do
irb(main):003:1*   private :+
irb(main):004:1> end
=> Fixnum
irb(main):005:0>
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/irb/input-method.rb:154:in `gets': private method `+' called for 4:Fixnum (NoMethodError)
~~~

Now, I am confused. Those behaviors are expected? In doc this is not clear.



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