PROBLEM: (QAR 66407, SPR HPAQA1TXX) (Patch ID: OSF425-405540) ******** This was a regression from an earlier version, so if a yacc specification worked in 3.2 and no longer works in 4.0, this may be the problem. This patch fixes a problem in yacc that causes it to generate parse tables that result in the parser not executing a user-specified error recovery action. The parser does a reduction instead of immediately detecting an error. The problem is described in the "lex & yacc" O'Reilly book, in a section called "Bugs in Yacc".