================================================================================
Simple Function
================================================================================

=> "Hiya"

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

(root
  (block
    (statement
      (expression
        (value
          (function
            (block
              (statement
                (expression
                  (value
                    (string)))))))))))

================================================================================
Function Assignment
================================================================================

x = => "Hiya"

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

(root
  (block
    (statement
      (assignment
        (identifier)
        (assignment_operator)
        (statement
          (expression
            (value
              (function
                (block
                  (statement
                    (expression
                      (value
                        (string)))))))))))))

================================================================================
Function Call
================================================================================

(foobar "Hiya")

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

(root
  (block
    (statement
      (expression
        (function_call
          (identifier)
          (expression
            (value
              (string))))))))

================================================================================
Complex Function
================================================================================

|message number| => {
  (output message)
  (output number)
}

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

(root
  (block
    (statement
      (expression
        (value
          (function
            (identifier_list
              (identifier)
              (identifier))
            (block
              (statement
                (expression
                  (function_call
                    (built_in_function
                      (expression
                        (identifier))))))
              (statement
                (expression
                  (function_call
                    (built_in_function
                      (expression
                        (identifier)))))))))))))

================================================================================
Complex Function Call
================================================================================

(foobar
    "hi"
    42
    map {
      x = 1
      y = 2
    }
)

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

(root
  (block
    (statement
      (expression
        (function_call
          (identifier)
          (expression
            (value
              (string)))
          (expression
            (value
              (integer)))
          (expression
            (value
              (map
                (block
                  (statement
                    (assignment
                      (identifier)
                      (assignment_operator)
                      (statement
                        (expression
                          (value
                            (integer))))))
                  (statement
                    (assignment
                      (identifier)
                      (assignment_operator)
                      (statement
                        (expression
                          (value
                            (integer)))))))))))))))