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--warnings=midrule-values to enable them. Discussed starting at <http://lists.gnu.org/archive/html/help-bison/2006-10/msg00030.html>. * NEWS (2.3a+): Mention. * src/getargs.c, src/getargs.h (warnings_args, warnings_types, enum warnings): Add entry for midrule-values subargument. * src/reader.c (symbol_should_be_used): Don't return true just because the value is a set/used mid-rule value unless --warnings=midrule-values was specified. * tests/input.at (Unused values, Unused values before symbol declarations): Run tests with and without --warnings=midrule-values. * src/reader.c (check_and_convert_grammar): Use symbol_list_free rather than LIST_FREE directly.