//// Copyright (c) 2009, Brian Frank and Andy Frank// Licensed under the Academic Free License version 3.0//// History:// 26 Mar 09 Brian Frank Creation//**** CancelledErr indicates that an operation was cancelled** before it completed normally.**const class CancelledErr : Err {**** Construct with specified error message and optional root cause.**new make(Str msg := "", Err? cause := null) }