%{
#define YYERROR_VERBOSE
void yyerror(char *);
%}
%verbose
%token ';' ID ILLEGAL_CHAR
%%
list:             outerList ';'
                ;
outerList:        /* empty */
                | outerList outerListItem
                ;
outerListItem:    innerList
                ;
innerList:        /* empty */
                | innerList innerListItem
                ;
innerListItem:    ID
                ;
%%
void yyerror(char *msg) {
    printf("\n%s\n", msg);
}
int main() {
    return yyparse();
}