Bug fix. Error recovery did not always work as expected. The generated

parser sometimes assumed that a token would not be deleted, and inserted
tokens in front of it, and then deleted the token after all. It should
at each error, first delete, and then insert.

util/LLgen/src/compute.c

@@ -759,6 +759,10 @@ STATIC int nsafes(p) register p_nont p; {
 	i = getntsafe(p);
 	if (i != NOSAFETY) {
 		i = do_safes(p->n_rule, i, &ch);
+		if (i < SCANDONE) i = SCANDONE;
+		/* After a nonterminal, we only know whether a scan was done
+		   or not
+		*/
 		if (getntout(p) != i) {
 			ch = 1;
 			setntout(p,i);