================================================================================
Simple Assignment
================================================================================

x = y

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

(root
  (statement
    (assignment
      (identifier)
      (assignment_operator)
      (statement
        (expression
          (identifier))))))

================================================================================
Map Item Assignment
================================================================================

x:y = 1

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

(root
  (statement
    (assignment
      (index
        (expression
          (identifier))
        (expression
          (identifier)))
      (assignment_operator)
      (statement
        (expression
          (value
            (integer)))))))

================================================================================
List Item Assignment
================================================================================

x:9 = 'foobar'

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

(root
  (statement
    (assignment
      (index
        (expression
          (identifier))
        (expression
          (value
            (integer))))
      (assignment_operator)
      (statement
        (expression
          (value
            (string)))))))