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Reported by Frank Heckenbach. https://lists.gnu.org/archive/html/bug-bison/2019-11/msg00016.html * data/skeletons/c++.m4 (b4_yytranslate_define): Don't use yyeof_ as if it had two different types. It is used once against the input argument, which is the value returned by yylex, which is an "external token number", typically an int. It is also used as output type, an "internal symbol number". It turns out that in both cases we mean "0", but let's keep yyeof_ only for the case "internal symbol number", i.e., _after_ conversion by yytranslate. This frees us from one cast.