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/opt/alt/ruby20/lib64/ruby/2.0.0/

//opt/alt/ruby20/lib64/ruby/2.0.0/dl.rb

 require 'dl.so'

begin
  require 'fiddle' unless Object.const_defined?(:Fiddle)
rescue LoadError
end

warn "DL is deprecated, please use Fiddle"

module DL
  # Returns true if DL is using Fiddle, the libffi wrapper.
  def self.fiddle?
    Object.const_defined?(:Fiddle)
  end
end