anchor.diff:  ----
   groovy:000> :grab 'com.google.guava:guava:19.0'
   groovy:000> import com.google.common.collect.BiMap
  -===\> com.google.common.collect.BiMap
  +===> com.google.common.collect.BiMap
   ----
   
   This command can be given at any time to add new dependencies.
  
positive.code: Display the contents of the current buffer.
  
  This only displays the buffer of an incomplete expression. Once the
  expression is complete, the buffer is rest. The prompt will update to
  show the size of the current buffer as well.
  
  [[GroovyShell-Example]]
  
negative.code: 
  ----
  groovy:000> def x = 3
  ===> 3
  groovy:000> x
  ===> 3
  ----
  
  It's especially useful for copy&pasting code from tutorials etc. into the running session.
  