(module
  (type $heap-object (sub (struct (field (mut i32)))))
  (type (func (param i32) (result)))
  (type (array (ref null 1)))
  (type (array (ref eq)))
  (func
    (param)
    (result (ref eq))
    (local (ref eq) (ref eq) (ref eq) (ref eq) (ref eq))
    (i32.const 1)
    (i32.const 2)
    i32.shl
    ref.i31)
  (export "main" (func 0)))