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    <p>The message you received is common when you have <strong><code>ruby 2.0.0p0 (2013-02-24)</code></strong> on top of <strong>Windows</strong>.</p> <p>The message "<code>DL is deprecated, please use Fiddle</code>" <strong>is not an error; it's only a warning</strong>.</p> <p>The source is the <a href="https://github.com/ruby/ruby/tree/trunk/ext/dl/lib" rel="noreferrer">Deprecation notice for DL</a> introduced some time ago in <code>dl.rb</code> ( see <a href="https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/37910/entry/ext/dl/lib/dl.rb" rel="noreferrer">revisions/37910</a> ).</p> <p>On Windows the <code>lib/ruby/site_ruby/2.0.0/readline.rb</code> file still requires <code>dl.rb</code> so the <strong>warning message</strong> comes out when you <code>require 'irb'</code> ( because irb requires <code>'readline'</code> ) or when anything else wants to <code>require 'readline'</code>.</p> <p>You can open <code>readline.rb</code> with your favorite text editor and look up the code ( near line 4369 ):</p> <pre><code> if RUBY_VERSION &lt; '1.9.1' require 'Win32API' else require 'dl' class Win32API DLL = {} </code></pre> <p>We can always hope for an improvement to work out this deprecation in future releases of <a href="http://www.ruby-lang.org/en/" rel="noreferrer">Ruby</a>.</p> <p>EDIT: For those wanting to go deeper about <strong>Fiddle</strong> vs <strong>DL</strong>, let it be said that their purpose is to dynamically link external libraries with Ruby; you can read on the ruby-doc website about <a href="http://www.ruby-doc.org/stdlib-2.0.0/libdoc/dl/rdoc/DL.html" rel="noreferrer">DL</a> or <a href="http://ruby-doc.org/stdlib-2.0.0/libdoc/fiddle/rdoc/Fiddle.html" rel="noreferrer">Fiddle</a>.</p>
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    1. PORuby 2.0.0p0 IRB warning: "DL is deprecated, please use Fiddle"
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    1. USFranco Rondini
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    1. COAs of ruby 2.0.0p247 - rbreadline.rb doesn't exist.
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      1. USwebRat
    2. CO@webRat Just re-edit the post; I agree with you, the rbrealine.rb was introduced by a wrong (I suppose) Edit by community. Thanks for your attention!
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    3. COAll this sounds so unsatisfactory. Anyway, taking note of the comment below from Msangle, "What is fiddle?"
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