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Unfortunately it is not possible to reuse the %prec directive. This is because to please POSIX, we do not require to end the rules with a semicolon. As a result, foo: bar %prec baz is ambiguous: either a rule which precedence is that of baz, or a rule, and then a declaration of the precedence of the token baz. * doc/bison.texinfo: Document %precedence. (Precedence Only): New. * src/assoc.h, src/assoc.c (precedence_assoc): New. * src/conflicts.c (resolve_sr_conflict): Support it. * src/scan-gram.l, src/parse-gram.y (%precedence): New token. Parse it. * tests/calc.at: Use %precedence for NEG. * tests/conflicts.at (%precedence does not suffice) (%precedence suffices): New tests.