[ruby-core:76917] [Ruby trunk Bug#12345] A module's private constants are given with `Module#constant(false)`

Issue #12345 has been updated by Usaku NAKAMURA.

Backport changed from 2.1: WONTFIX, 2.2: REQUIRED, 2.3: DONE to 2.1: WONTFIX, 2.2: DONE, 2.3: DONE

ruby_2_2 r55930 merged revision(s) 55705.

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Bug #12345: A module's private constants are given with `Module#constant(false)`
https://bugs.ruby-lang.org/issues/12345#change-60148

* Author: Tsuyoshi Sawada
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: WONTFIX, 2.2: DONE, 2.3: DONE
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A module's private constants are given with `Module#constant(false)`.

~~~ruby
module A
  X = 1
  Y = 2
  private_constant :Y
end

module B
  Z = 3
  W = 4
  private_constant :W
end

A.constants        # => [:X]
A.constants(false) # => [:X, :Y]

A.include B
A.constants        # => [:X, :Z]
A.constants(false) # => [:X, :Y]
~~~

Besides this, I request a way to get the private constants of a module. I want:

~~~ruby

A.private_constants        # => [:Y]
A.private_constants(false) # => [:Y]

A.include B
A.private_constants        # => [:Y, :W]
A.private_constants(false) # => [:Y]
~~~



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