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The C++ implementation of LAC did not skip the $undefined token, probably because it was not exposed. Expose it, and use clearer names. * data/skeletons/c++.m4: Don't define undef_token_ in yytranslate_, but... * data/skeletons/lalr1.cc (yy_undef_token_): here. Use a more precise type to define yy_undef_token_ and yy_error_token_. Unfortunately we move from a compile-time value defined via an enum to a static const member. Eventually we should make it constexpr. Make LAC implementation more alike yacc.c's one.