//// Copyright (c) 2023, Brian Frank and Andy Frank// Licensed under the Academic Free License version 3.0//// History:// 16 Aug 23 Brian Frank Creation//**** QueueOverflowErr is raised by a Future for messages sent to** actor that has exceeded the max queue size.**const class QueueOverflowErr : Err {**** Construct with specified error message and optional root cause.**new make(Str msg := "", Err? cause := null) : super(msg, cause) {} }