> 256 is the error token, and 257 is the undef token (when we receive unknown > tokens from yylex). > > 256 is mandated by POSIX : > > https://pubs.opengroup.org/onlinepubs/007904875/utilities/yacc.html > > > The token error shall be reserved for error handling. The name error can be > > used in grammar rules. It indicates places where the parser can recover > > from a syntax error. The default value of error shall be 256. Its value can > > be changed using a %token declaration. The lexical analyzer should not > > return the value of error. > > It seems to say that we should be able to change the value with `%token error > 2400`, but we don't support that. (checking...) OMG, we do support it! New > test case...
OK. I find 256. But 257 is not found anywhere in y.tab.c or y.tab.h? y.tab.c:#define YYERRCODE 256 Also, YYERRCODE is not found in the manual, should it be mentioned there? -- Regards, Peng _______________________________________________ help-bison@gnu.org https://lists.gnu.org/mailman/listinfo/help-bison
