--- stack/stack.c	2002/03/12 21:05:11	1.107
+++ stack/stack.c	2002/03/12 22:03:21	1.108
@@ -37,6 +37,8 @@
 #include <unistd.h>
 /* EX_NOINPUT, EX_USAGE */
 #include <sysexits.h>
+/* assert */
+#include <assert.h>
 
 #ifdef __linux__
 /* mtrace, muntrace */
@@ -121,6 +123,7 @@
   stackitem *nitem= malloc(sizeof(stackitem));
 
   nval->content.ptr= NULL;
+  nval->type= integer;
 
   nitem->item= nval;
   nitem->next= env->gc_ref;
@@ -258,6 +261,7 @@
   value *new_value= new_val(env);
 
   new_value->content.c= malloc(sizeof(cons));
+  assert(new_value->content.c!=NULL);
   new_value->type= tcons;
   CAR(new_value)= val;
   CDR(new_value)= env->head;
@@ -996,7 +1000,7 @@
   }
 
   if(myenv.interactive) {
-    printf("Stack version $Revision: 1.107 $\n\
+    printf("Stack version $Revision: 1.108 $\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\
@@ -1263,7 +1267,6 @@
 
   protect(old_value);
   new_value= new_val(env);
-  protect(new_value);
   new_value->type= old_value->type;
 
   switch(old_value->type){
@@ -1278,15 +1281,16 @@
       strdup((char *)(old_value->content.ptr));
     break;
   case tcons:
-    new_value= NULL;
 
     new_value->content.c= malloc(sizeof(cons));
+    assert(new_value->content.c!=NULL);
+
     CAR(new_value)= copy_val(env, CAR(old_value)); /* recurse */
     CDR(new_value)= copy_val(env, CDR(old_value)); /* recurse */
     break;
   }
 
-  unprotect(old_value); unprotect(new_value);
+  unprotect(old_value);
 
   return new_value;
 }