// // Copyright (c) 2006, Brian Frank and Andy Frank // Licensed under the Academic Free License version 3.0 // // History: // 11 Jan 06 Brian Frank Creation // ** ** UnknownSlotErr indicates an attempt to access a non-existent slot. ** const class UnknownSlotErr : Err { ** ** Construct with specified error message and optional root cause. ** new make(Str msg := "", Err? cause := null) }