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Reported by Florian Krohm at <http://lists.gnu.org/archive/html/bug-bison/2009-12/msg00005.html>. * NEWS (2.4.2): Document. * src/reader.c (grammar_rule_check): Implement. (grammar_current_rule_prec_set): Add comments explaining that we here assume a %prec identifier is a token, but we still manage to support POSIX. * tests/input.at (%prec's token must be defined): New test group.