--- stack/stack.c	2002/03/21 03:19:32	1.120
+++ stack/stack.c	2002/03/27 19:53:01	1.123
@@ -1109,7 +1109,7 @@
   }
 
   if(myenv.interactive) {
-    printf("Stack version $Revision: 1.120 $\n\
+    printf("Stack version $Revision: 1.123 $\n\
 Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
 Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\
 This is free software, and you are welcome to redistribute it\n\
@@ -1651,7 +1651,7 @@
 
   iterator= foo;
 
-  while(iterator!=NULL) {
+  while(iterator->type!=empty) {
     push_val(env, CAR(iterator));
     push_val(env, loop);
     eval(env); if(env->err) return;
@@ -1670,7 +1670,9 @@
 extern void to(environment *env)
 {
   int ending, start, i;
-  value *iterator, *temp;
+  value *iterator, *temp, *end;
+
+  end= new_val(env);
 
   if(env->head->type==empty || CDR(env->head)->type==empty) {
     printerr("Too Few Arguments");
@@ -1705,11 +1707,11 @@
   if(iterator->type==empty
      || (CAR(iterator)->type==symb
 	 && CAR(iterator)->content.sym->id[0]=='[')) {
-    temp= NULL;
+    temp= end;
     toss(env);
   } else {
     /* Search for first delimiter */
-    while(CDR(iterator)!=NULL 
+    while(CDR(iterator)->type!=empty 
 	  && (CAR(CDR(iterator))->type!=symb
 	      || CAR(CDR(iterator))->content.sym->id[0]!='['))
       iterator= CDR(iterator);
@@ -1717,9 +1719,9 @@
     /* Extract list */
     temp= env->head;
     env->head= CDR(iterator);
-    CDR(iterator)= NULL;
+    CDR(iterator)= end;
 
-    if(env->head!=NULL)
+    if(env->head->type!=empty)
       toss(env);
   }
 
@@ -2524,3 +2526,9 @@
   swap(env); if(env->err) return;
   toss(env);
 }
+
+extern void sx_646f(environment *env)
+{
+  swap(env); if(env->err) return;
+  eval(env);
+}