1(module 2 (func (export "externref") (result externref) (ref.null extern)) 3 (func (export "funcref") (result funcref) (ref.null func)) 4 5 (global externref (ref.null extern)) 6 (global funcref (ref.null func)) 7) 8 9(assert_return (invoke "externref") (ref.null extern)) 10(assert_return (invoke "funcref") (ref.null func))