    "[[Assertion failure|AssertionError]] that occurs when a
     value reference could not be initialized, including when:

     - a toplevel value could not be initialized due to
       recursive dependencies upon other toplevel values,
     - an uninitialized [[late]] value is evaluated,
     - an initialized `late` but non-`variable` value is
       reassigned."
    see (`function late`)
    shared class InitializationError(String description)
            extends AssertionError(description) {}