================================================================================
Anonymous Function
================================================================================

() <str> { "Hiya" }

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

(root
  (statement
    (statement_kind
      (expression
        (value
          (anonymous_function
            (type_specification
              (type))
            (block
              (statement
                (statement_kind
                  (expression
                    (value
                      (string))))))))))))

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

foobar = (x <int>, y <int>) <int> {
  x + y
}

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

(root
  (statement
    (statement_kind
      (assignment
        (identifier)
        (assignment_operator)
        (statement
          (statement_kind
            (expression
              (value
                (anonymous_function
                  (identifier)
                  (type_specification
                    (type))
                  (identifier)
                  (type_specification
                    (type))
                  (type_specification
                    (type))
                  (block
                    (statement
                      (statement_kind
                        (expression
                          (math
                            (expression
                              (identifier))
                            (math_operator)
                            (expression
                              (identifier))))))))))))))))

================================================================================
Identifier Function Call
================================================================================

foobar("Hiya")

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

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

================================================================================
Index Function Call
================================================================================

foo:bar("Hiya")

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

(root
  (statement
    (statement_kind
      (expression
        (function_call
          (function_expression
            (index
              (index_expression
                (identifier))
              (index_expression
                (identifier))))
          (expression
            (value
              (string))))))))

================================================================================
Double Function Call
================================================================================

foobar()("Hiya")

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

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

================================================================================
Anonymous Function Call
================================================================================

(msg <str>) <str> { msg } ("Hiya");

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

(root
  (statement
    (statement_kind
      (expression
        (function_call
          (function_expression
            (value
              (anonymous_function
                (identifier)
                (type_specification
                  (type))
                (type_specification
                  (type))
                (block
                  (statement
                    (statement_kind
                      (expression
                        (identifier))))))))
          (expression
            (value
              (string))))))))

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

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

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

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

================================================================================
Callback Function Call
================================================================================

x(() <bool> { true })

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

(root
  (statement
    (statement_kind
      (expression
        (function_call
          (function_expression
            (identifier))
          (expression
            (value
              (anonymous_function
                (type_specification
                  (type))
                (block
                  (statement
                    (statement_kind
                      (expression
                        (value
                          (boolean))))))))))))))

================================================================================
Nested Function Call
================================================================================

from_json(read('file.json'))

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

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