================================================================================
Special Character - bracket
================================================================================

echo [
echo ]
echo test]
echo [test]
echo test[]

--------------------------------------------------------------------------------

(program
  (command
    name: (word)
    argument: (word))
  (command
    name: (word)
    argument: (word))
  (command
    name: (word)
    argument: (concatenation
      (word)))
  (command
    name: (word)
    argument: (concatenation
      (word)))
  (command
    name: (word)
    argument: (concatenation
      (word))))
