<caret_1>:
  KDocName(302,330): 'Container.containerExtension'
    null

<caret_2>:
  KDocName(347,376): 'TContainer.containerExtension'
    null

<caret_3>:
  KDocName(393,433): 'TNumberBoundContainer.containerExtension'
    null

<caret_4>:
  KDocName(450,484): 'NumberContainer.containerExtension'
    null

<caret_5>:
  KDocName(501,532): 'IntContainer.containerExtension'
    null

<caret_6>:
  KDocName(549,583): 'StringContainer.containerExtension'
    null
