Project
  [ Project
      [ Unit
          [ DocBlock
              [ Fenced
                  [ "Here is a fenced code block."
                  , "    All internal     whitespace is preserved."
                  , "But not trailing whitespace."
                  ]
              , Fenced
                  [ "We can do better too."
                  , "  This will be good."
                  , "Adapt to find real indent."
                  ]
              ]
          ]
      ]
  ]