Transcript show "Hello world".
Standard input is empty
Object: TextCollector new "<0x7f4a7d904c00>" error: did not understand #show MessageNotUnderstood(Exception)>>signal (ExcHandling.st:254) TextCollector(Object)>>doesNotUnderstand: #show (SysExcept.st:1448) UndefinedObject>>executeStatements (prog:1)