Remove not used fields from ERROR

parse.y

@@ -12087,9 +12087,6 @@ static rb_node_error_t *
 rb_node_error_new(struct parser_params *p, const YYLTYPE *loc)
 {
     rb_node_error_t *n = NODE_NEWNODE(NODE_ERROR, rb_node_error_t, loc);
-    n->not_used = 0;
-    n->not_used2 = 0;
-    n->not_used3 = 0;
 
     return n;
 }

rubyparser.h

@@ -981,10 +981,6 @@ typedef struct RNode_FNDPTN {
 
 typedef struct RNode_ERROR {
     NODE node;
-
-    VALUE not_used;
-    VALUE not_used2;
-    VALUE not_used3;
 } rb_node_error_t;
 
 #define RNODE(obj)  ((struct RNode *)(obj))