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

foo <fn -> str> || { "Hiya" }

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

(root
  (statement
    (function_declaration
      (identifier)
      (type_definition
        (type
          (type)))
      (function
        (block
          (statement
            (expression
              (value
                (string)))))))))

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

(foobar "Hiya")

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

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

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

foobar <fn str num> |message number| {
  (output message)
  (output number)
}

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

(root
  (statement
    (function_declaration
      (identifier)
      (type_definition
        (type
          (type)
          (type)))
      (function
        (identifier)
        (identifier)
        (block
          (statement
            (expression
              (function_call
                (expression
                  (identifier))
                (expression
                  (identifier)))))
          (statement
            (expression
              (function_call
                (expression
                  (identifier))
                (expression
                  (identifier))))))))))

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

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

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

(root
  (statement
    (expression
      (function_call
        (expression
          (identifier))
        (expression
          (value
            (string)))
        (expression
          (value
            (integer)))
        (expression
          (value
            (map
              (identifier)
              (statement
                (expression
                  (value
                    (integer))))
              (identifier)
              (statement
                (expression
                  (value
                    (integer)))))))))))