================================================================================
Simple Structure
================================================================================

struct Foo {
	x <int>
	y <float>
}

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

(root
  (statement
    (type_definition
      (struct_definition
        (identifier)
        (identifier)
        (type_specification
          (type))
        (identifier)
        (type_specification
          (type))))))

================================================================================
Nested Structure
================================================================================

struct Foo {
	x <int>
	y <float> = 0.0

    bar <Bar> = new Bar {
      baz = 42
    }
}

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

(root
  (statement
    (type_definition
      (struct_definition
        (identifier)
        (identifier)
        (type_specification
          (type))
        (identifier)
        (type_specification
          (type))
        (statement
          (expression
            (value
              (float))))
        (identifier)
        (type_specification
          (type
            (identifier)))
        (statement
          (expression
            (value
              (struct_instance
                (identifier)
                (map
                  (identifier)
                  (statement
                    (expression
                      (value
                        (integer)))))))))))))