Next: Berkeley Yacc, Previous: The ancestral Yacc, Up: A Brief History of the Greater Ungulates [Contents][Index]
One of the deficiencies of original Yacc was its inability to produce reentrant parsers. This was first remedied by a set of drop-in modifications called “yacchack”, published by Eric S. Raymond on USENET around 1983. This code was quickly forgotten when zoo and Berkeley Yacc became available a few years later.