// // Copyright (c) 2009, Brian Frank and Andy Frank // Licensed under the Academic Free License version 3.0 // // History: // 14 May 09 Brian Frank Creation // ** ** UnknownSymbolErr indicates an attempt to access a non-existent symbol. ** const class UnknownSymbolErr : Err { ** ** Construct with specified error message and optional root cause. ** new make(Str? msg := null, Err? cause := null) }