Change Details

`yyerror` actually returns void.

According to the [[ https://pubs.opengroup.org/onlinepubs/9699919799/utilities/yacc.html | POSIX standard ]] `yyerror` should return `int`.

`yyerror` actually returns voidAccording to the [[ https://pubs.opengroup.org/onlinepubs/9699919799/utilities/yacc.html | POSIX standard ]] `yyerror` should return `int`.