@Documented @Retention(value=RUNTIME) @Target(value={TYPE_USE,TYPE_PARAMETER}) @SubtypeOf(value={}) public @interface ReadOnly
A ReadOnly
reference could refer to a Mutable or an Immutable
object. An object may not be mutated through a read only reference,
except if the field is marked Assignable
. Only a method with a
readonly receiver can be called using a readonly reference.