anchor.diff:  [.output]
   ....
   Asciidoctor 1.5.2 [http://asciidoctor.org]
  -Runtime Environment (ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]) (lc:UTF-8 fs:UTF-8 in:- ex:UTF-8)
  +Runtime Environment (ruby 2.2.2p95 [x86_64-linux]) (lc:UTF-8 fs:UTF-8 in:- ex:UTF-8)
   ....
   
   Asciidoctor also provides an API.
  
positive.code: 
  Asciidoctor works on Linux, OSX (Mac) and Windows and requires one of the following implementations of {uri-ruby}[Ruby]:
  
  * MRI (Ruby 1.8.7, 1.9.3, 2.0.0 & 2.1.2)
  * JRuby 1.7 (Ruby 1.8 and 1.9 modes)
  * Rubinius 2.2.x
  * Opal (JavaScript)
  
  
negative.code: // settings:
  :page-layout: base
  :idprefix:
  :idseparator: -
  :source-language: ruby
  :language: {source-language}
  