From: danzoid61@...
Date: 2016-04-11T20:07:41+00:00
Subject: [ruby-core:74881] [Ruby trunk Feature#12267] REXML Authoring constants are unwanted (or clash) when mixing into other namespaces

Issue #12267 has been reported by Dan Rathbun.

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Feature #12267: REXML Authoring constants are unwanted (or clash) when mixing into other namespaces
https://bugs.ruby-lang.org/issues/12267

* Author: Dan Rathbun
* Status: Open
* Priority: Normal
* Assignee: 
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The following file can be added, OR it's contents pasted into "rexml/rexml.rb". Basically it renames the authoring constants defined in "rexml/rexml.rb", with a "REXML_" prefix. But it only does so when REXML module is mixed into some other class or module namespace.

```
# -*- encoding: utf-8 -*-
# frozen_string_literal: false
#
# "rexml_mixin.rb" : include() and prepend() control

require "rexml/rexml.rb"

module REXML

  ###
  #
  # When mixing the REXML module into other classes and modules,
  # RENAME the 6 constants declared in "rexml/rexml.rb", because they
  # will likely conflict with the "mixee"'s constants of same name.
  #
  ###

  def self::append_features(mod)
    
    [:COPYRIGHT,:DATE,:VERSION,:REVISION,:Copyright,:Version].each {|id|
      const_set( "REXML_#{id.to_s}", REXML.const_get(id) )
      remove_const(id)
    }

    super(mod)

  end

  def self::prepend_features(mod)
    
    [:COPYRIGHT,:DATE,:VERSION,:REVISION,:Copyright,:Version].each {|id|
      const_set( "REXML_#{id.to_s}", REXML.const_get(id) )
      remove_const(id)
    }

    super(mod)

  end

  ### Do not think these constants need renaming for extend_object().

end
```



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