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3b05de2d05
Some people have been using that symbol. Some even have #defined it themselves. https://lists.gnu.org/r/bison-patches/2020-04/msg00138.html Let's provide backward compatibility, having it point to YYUNDEF, so that an error message is generated. * data/skeletons/yacc.c (YYERRCODE): New, at the exact same location it was defined before.